Source file src/net/http/internal/http2/server_test.go

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package http2_test
     6  
     7  import (
     8  	"bytes"
     9  	"compress/gzip"
    10  	"compress/zlib"
    11  	"context"
    12  	"crypto/tls"
    13  	"crypto/x509"
    14  	"errors"
    15  	"flag"
    16  	"fmt"
    17  	"io"
    18  	"log"
    19  	"math"
    20  	"net"
    21  	"net/http"
    22  	"net/http/httptest"
    23  	"os"
    24  	"reflect"
    25  	"runtime"
    26  	"slices"
    27  	"strconv"
    28  	"strings"
    29  	"sync"
    30  	"testing"
    31  	"testing/synctest"
    32  	"time"
    33  	_ "unsafe" // for go:linkname
    34  
    35  	"net/http/internal/http2"
    36  	. "net/http/internal/http2"
    37  	"net/http/internal/testcert"
    38  
    39  	"golang.org/x/net/http2/hpack"
    40  )
    41  
    42  var stderrVerbose = flag.Bool("stderr_verbose", false, "Mirror verbosity to stderr, unbuffered")
    43  
    44  func stderrv() io.Writer {
    45  	if *stderrVerbose {
    46  		return os.Stderr
    47  	}
    48  
    49  	return io.Discard
    50  }
    51  
    52  type safeBuffer struct {
    53  	b bytes.Buffer
    54  	m sync.Mutex
    55  }
    56  
    57  func (sb *safeBuffer) Write(d []byte) (int, error) {
    58  	sb.m.Lock()
    59  	defer sb.m.Unlock()
    60  	return sb.b.Write(d)
    61  }
    62  
    63  func (sb *safeBuffer) Bytes() []byte {
    64  	sb.m.Lock()
    65  	defer sb.m.Unlock()
    66  	return sb.b.Bytes()
    67  }
    68  
    69  func (sb *safeBuffer) Len() int {
    70  	sb.m.Lock()
    71  	defer sb.m.Unlock()
    72  	return sb.b.Len()
    73  }
    74  
    75  type serverTester struct {
    76  	cc           net.Conn // client conn
    77  	t            *testing.T
    78  	h1server     *http.Server
    79  	h2server     *Server
    80  	serverLogBuf safeBuffer // logger for httptest.Server
    81  	logFilter    []string   // substrings to filter out
    82  	scMu         sync.Mutex // guards sc
    83  	sc           *ServerConn
    84  	wrotePreface bool
    85  	testConnFramer
    86  
    87  	callsMu sync.Mutex
    88  	calls   []*serverHandlerCall
    89  
    90  	// If http2debug!=2, then we capture Frame debug logs that will be written
    91  	// to t.Log after a test fails. The read and write logs use separate locks
    92  	// and buffers so we don't accidentally introduce synchronization between
    93  	// the read and write goroutines, which may hide data races.
    94  	frameReadLogMu   sync.Mutex
    95  	frameReadLogBuf  bytes.Buffer
    96  	frameWriteLogMu  sync.Mutex
    97  	frameWriteLogBuf bytes.Buffer
    98  
    99  	// writing headers:
   100  	headerBuf bytes.Buffer
   101  	hpackEnc  *hpack.Encoder
   102  }
   103  
   104  type twriter struct {
   105  	t  testing.TB
   106  	st *serverTester // optional
   107  }
   108  
   109  func (w twriter) Write(p []byte) (n int, err error) {
   110  	if w.st != nil {
   111  		ps := string(p)
   112  		for _, phrase := range w.st.logFilter {
   113  			if strings.Contains(ps, phrase) {
   114  				return len(p), nil // no logging
   115  			}
   116  		}
   117  	}
   118  	w.t.Logf("%s", p)
   119  	return len(p), nil
   120  }
   121  
   122  func newTestServer(t testing.TB, handler http.HandlerFunc, opts ...any) *httptest.Server {
   123  	t.Helper()
   124  	if handler == nil {
   125  		handler = func(w http.ResponseWriter, req *http.Request) {}
   126  	}
   127  	ts := httptest.NewUnstartedServer(handler)
   128  	ts.EnableHTTP2 = true
   129  	ts.Config.ErrorLog = log.New(twriter{t: t}, "", log.LstdFlags)
   130  	ts.Config.Protocols = protocols("h2")
   131  	for _, opt := range opts {
   132  		switch v := opt.(type) {
   133  		case func(*httptest.Server):
   134  			v(ts)
   135  		case func(*http.Server):
   136  			v(ts.Config)
   137  		case func(*http.HTTP2Config):
   138  			if ts.Config.HTTP2 == nil {
   139  				ts.Config.HTTP2 = &http.HTTP2Config{}
   140  			}
   141  			v(ts.Config.HTTP2)
   142  		default:
   143  			t.Fatalf("unknown newTestServer option type %T", v)
   144  		}
   145  	}
   146  
   147  	if ts.Config.Protocols.HTTP2() {
   148  		ts.TLS = testServerTLSConfig
   149  		if ts.Config.TLSConfig != nil {
   150  			ts.TLS = ts.Config.TLSConfig
   151  		}
   152  		ts.StartTLS()
   153  	} else if ts.Config.Protocols.UnencryptedHTTP2() {
   154  		ts.EnableHTTP2 = false // actually just disables HTTP/2 over TLS
   155  		ts.Start()
   156  	} else {
   157  		t.Fatalf("Protocols contains neither HTTP2 nor UnencryptedHTTP2")
   158  	}
   159  
   160  	t.Cleanup(func() {
   161  		ts.CloseClientConnections()
   162  		ts.Close()
   163  	})
   164  
   165  	return ts
   166  }
   167  
   168  type serverTesterOpt string
   169  
   170  var optFramerReuseFrames = serverTesterOpt("frame_reuse_frames")
   171  
   172  var optQuiet = func(server *http.Server) {
   173  	server.ErrorLog = log.New(io.Discard, "", 0)
   174  }
   175  
   176  func newServerTester(t *testing.T, handler http.HandlerFunc, opts ...any) *serverTester {
   177  	t.Helper()
   178  
   179  	h1server := &http.Server{}
   180  	var tlsState *tls.ConnectionState
   181  	for _, opt := range opts {
   182  		switch v := opt.(type) {
   183  		case func(*http.Server):
   184  			v(h1server)
   185  		case func(*http.HTTP2Config):
   186  			if h1server.HTTP2 == nil {
   187  				h1server.HTTP2 = &http.HTTP2Config{}
   188  			}
   189  			v(h1server.HTTP2)
   190  		case func(*tls.ConnectionState):
   191  			if tlsState == nil {
   192  				tlsState = &tls.ConnectionState{
   193  					Version:     tls.VersionTLS13,
   194  					ServerName:  "go.dev",
   195  					CipherSuite: tls.TLS_AES_128_GCM_SHA256,
   196  				}
   197  			}
   198  			v(tlsState)
   199  		default:
   200  			t.Fatalf("unknown newServerTester option type %T", v)
   201  		}
   202  	}
   203  
   204  	tlsConfig := h1server.TLSConfig
   205  	if tlsConfig == nil {
   206  		cert, err := tls.X509KeyPair(testcert.LocalhostCert, testcert.LocalhostKey)
   207  		if err != nil {
   208  			t.Fatal(err)
   209  		}
   210  		tlsConfig = &tls.Config{
   211  			Certificates:       []tls.Certificate{cert},
   212  			InsecureSkipVerify: true,
   213  			NextProtos:         []string{"h2"},
   214  		}
   215  		h1server.TLSConfig = tlsConfig
   216  	}
   217  
   218  	var cli, srv net.Conn
   219  
   220  	cliPipe, srvPipe := synctestNetPipe()
   221  
   222  	if h1server.Protocols != nil && h1server.Protocols.UnencryptedHTTP2() {
   223  		cli, srv = cliPipe, srvPipe
   224  	} else {
   225  		cli = tls.Client(cliPipe, &tls.Config{
   226  			InsecureSkipVerify: true,
   227  			NextProtos:         []string{"h2"},
   228  		})
   229  		srv = tls.Server(srvPipe, tlsConfig)
   230  	}
   231  
   232  	st := &serverTester{
   233  		t:        t,
   234  		cc:       cli,
   235  		h1server: h1server,
   236  	}
   237  	st.hpackEnc = hpack.NewEncoder(&st.headerBuf)
   238  	if h1server.ErrorLog == nil {
   239  		h1server.ErrorLog = log.New(io.MultiWriter(stderrv(), twriter{t: t, st: st}, &st.serverLogBuf), "", log.LstdFlags)
   240  	}
   241  
   242  	if handler == nil {
   243  		handler = serverTesterHandler{st}.ServeHTTP
   244  	}
   245  	h1server.Handler = handler
   246  
   247  	t.Cleanup(func() {
   248  		st.Close()
   249  		time.Sleep(GoAwayTimeout) // give server time to shut down
   250  	})
   251  
   252  	connc := make(chan *ServerConn)
   253  	h1server.ConnContext = func(ctx context.Context, conn net.Conn) context.Context {
   254  		ctx = context.WithValue(ctx, NewConnContextKey, func(sc *ServerConn) {
   255  			connc <- sc
   256  		})
   257  		if tlsState != nil {
   258  			ctx = context.WithValue(ctx, ConnectionStateContextKey, func() tls.ConnectionState {
   259  				return *tlsState
   260  			})
   261  		}
   262  		return ctx
   263  	}
   264  	go func() {
   265  		li := newOneConnListener(srv)
   266  		t.Cleanup(func() {
   267  			li.Close()
   268  		})
   269  		h1server.Serve(li)
   270  	}()
   271  	if cliTLS, ok := cli.(*tls.Conn); ok {
   272  		if err := cliTLS.Handshake(); err != nil {
   273  			t.Fatalf("client TLS handshake: %v", err)
   274  		}
   275  		cliTLS.SetReadDeadline(time.Now())
   276  	} else {
   277  		// Confusing but difficult to fix: Preface must be written
   278  		// before the conn appears on connc.
   279  		st.writePreface()
   280  		st.wrotePreface = true
   281  		cliPipe.SetReadDeadline(time.Now())
   282  	}
   283  	st.sc = <-connc
   284  
   285  	st.fr = NewFramer(st.cc, st.cc)
   286  	st.testConnFramer = testConnFramer{
   287  		t:   t,
   288  		fr:  NewFramer(cli, cli),
   289  		dec: hpack.NewDecoder(InitialHeaderTableSize, nil),
   290  	}
   291  	synctest.Wait()
   292  	return st
   293  }
   294  
   295  type netConnWithConnectionState struct {
   296  	net.Conn
   297  	state tls.ConnectionState
   298  }
   299  
   300  func (c *netConnWithConnectionState) ConnectionState() tls.ConnectionState {
   301  	return c.state
   302  }
   303  
   304  func (c *netConnWithConnectionState) HandshakeContext() tls.ConnectionState {
   305  	return c.state
   306  }
   307  
   308  type serverTesterHandler struct {
   309  	st *serverTester
   310  }
   311  
   312  func (h serverTesterHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
   313  	call := &serverHandlerCall{
   314  		w:   w,
   315  		req: req,
   316  		ch:  make(chan func()),
   317  	}
   318  	h.st.t.Cleanup(call.exit)
   319  	h.st.callsMu.Lock()
   320  	h.st.calls = append(h.st.calls, call)
   321  	h.st.callsMu.Unlock()
   322  	for f := range call.ch {
   323  		f()
   324  	}
   325  }
   326  
   327  // serverHandlerCall is a call to the server handler's ServeHTTP method.
   328  type serverHandlerCall struct {
   329  	w         http.ResponseWriter
   330  	req       *http.Request
   331  	closeOnce sync.Once
   332  	ch        chan func()
   333  }
   334  
   335  // do executes f in the handler's goroutine.
   336  func (call *serverHandlerCall) do(f func(http.ResponseWriter, *http.Request)) {
   337  	donec := make(chan struct{})
   338  	call.ch <- func() {
   339  		defer close(donec)
   340  		f(call.w, call.req)
   341  	}
   342  	<-donec
   343  }
   344  
   345  // exit causes the handler to return.
   346  func (call *serverHandlerCall) exit() {
   347  	call.closeOnce.Do(func() {
   348  		close(call.ch)
   349  	})
   350  }
   351  
   352  // sync waits for all goroutines to idle.
   353  func (st *serverTester) sync() {
   354  	synctest.Wait()
   355  }
   356  
   357  // advance advances synthetic time by a duration.
   358  func (st *serverTester) advance(d time.Duration) {
   359  	time.Sleep(d)
   360  	synctest.Wait()
   361  }
   362  
   363  func (st *serverTester) authority() string {
   364  	return "dummy.tld"
   365  }
   366  
   367  func (st *serverTester) addLogFilter(phrase string) {
   368  	st.logFilter = append(st.logFilter, phrase)
   369  }
   370  
   371  func (st *serverTester) nextHandlerCall() *serverHandlerCall {
   372  	st.t.Helper()
   373  	synctest.Wait()
   374  	st.callsMu.Lock()
   375  	defer st.callsMu.Unlock()
   376  	if len(st.calls) == 0 {
   377  		st.t.Fatal("expected server handler call, got none")
   378  	}
   379  	call := st.calls[0]
   380  	st.calls = st.calls[1:]
   381  	return call
   382  }
   383  
   384  func (st *serverTester) streamExists(id uint32) bool {
   385  	return st.sc.TestStreamExists(id)
   386  }
   387  
   388  func (st *serverTester) streamState(id uint32) StreamState {
   389  	return st.sc.TestStreamState(id)
   390  }
   391  
   392  func (st *serverTester) Close() {
   393  	if st.t.Failed() {
   394  		st.frameReadLogMu.Lock()
   395  		if st.frameReadLogBuf.Len() > 0 {
   396  			st.t.Logf("Framer read log:\n%s", st.frameReadLogBuf.String())
   397  		}
   398  		st.frameReadLogMu.Unlock()
   399  
   400  		st.frameWriteLogMu.Lock()
   401  		if st.frameWriteLogBuf.Len() > 0 {
   402  			st.t.Logf("Framer write log:\n%s", st.frameWriteLogBuf.String())
   403  		}
   404  		st.frameWriteLogMu.Unlock()
   405  
   406  		// If we failed already (and are likely in a Fatal,
   407  		// unwindowing), force close the connection, so the
   408  		// httptest.Server doesn't wait forever for the conn
   409  		// to close.
   410  		if st.cc != nil {
   411  			st.cc.Close()
   412  		}
   413  	}
   414  	if st.cc != nil {
   415  		st.cc.Close()
   416  	}
   417  	log.SetOutput(os.Stderr)
   418  }
   419  
   420  // greet initiates the client's HTTP/2 connection into a state where
   421  // frames may be sent.
   422  func (st *serverTester) greet() {
   423  	st.t.Helper()
   424  	st.greetAndCheckSettings(func(Setting) error { return nil })
   425  }
   426  
   427  func (st *serverTester) greetAndCheckSettings(checkSetting func(s Setting) error) {
   428  	st.t.Helper()
   429  	st.writePreface()
   430  	st.writeSettings()
   431  	st.sync()
   432  	readFrame[*SettingsFrame](st.t, st).ForeachSetting(checkSetting)
   433  	st.writeSettingsAck()
   434  
   435  	// The initial WINDOW_UPDATE and SETTINGS ACK can come in any order.
   436  	var gotSettingsAck bool
   437  	var gotWindowUpdate bool
   438  
   439  	for range 2 {
   440  		f := st.readFrame()
   441  		if f == nil {
   442  			st.t.Fatal("wanted a settings ACK and window update, got none")
   443  		}
   444  		switch f := f.(type) {
   445  		case *SettingsFrame:
   446  			if !f.Header().Flags.Has(FlagSettingsAck) {
   447  				st.t.Fatal("Settings Frame didn't have ACK set")
   448  			}
   449  			gotSettingsAck = true
   450  
   451  		case *WindowUpdateFrame:
   452  			if f.FrameHeader.StreamID != 0 {
   453  				st.t.Fatalf("WindowUpdate StreamID = %d; want 0", f.FrameHeader.StreamID)
   454  			}
   455  			gotWindowUpdate = true
   456  
   457  		default:
   458  			st.t.Fatalf("Wanting a settings ACK or window update, received a %T", f)
   459  		}
   460  	}
   461  
   462  	if !gotSettingsAck {
   463  		st.t.Fatalf("Didn't get a settings ACK")
   464  	}
   465  	if !gotWindowUpdate {
   466  		st.t.Fatalf("Didn't get a window update")
   467  	}
   468  }
   469  
   470  func (st *serverTester) writePreface() {
   471  	if st.wrotePreface {
   472  		return
   473  	}
   474  	n, err := st.cc.Write([]byte(ClientPreface))
   475  	if err != nil {
   476  		st.t.Fatalf("Error writing client preface: %v", err)
   477  	}
   478  	if n != len(ClientPreface) {
   479  		st.t.Fatalf("Writing client preface, wrote %d bytes; want %d", n, len(ClientPreface))
   480  	}
   481  }
   482  
   483  func (st *serverTester) encodeHeaderField(k, v string) {
   484  	err := st.hpackEnc.WriteField(hpack.HeaderField{Name: k, Value: v})
   485  	if err != nil {
   486  		st.t.Fatalf("HPACK encoding error for %q/%q: %v", k, v, err)
   487  	}
   488  }
   489  
   490  // encodeHeaderRaw is the magic-free version of encodeHeader.
   491  // It takes 0 or more (k, v) pairs and encodes them.
   492  func (st *serverTester) encodeHeaderRaw(headers ...string) []byte {
   493  	if len(headers)%2 == 1 {
   494  		panic("odd number of kv args")
   495  	}
   496  	st.headerBuf.Reset()
   497  	for len(headers) > 0 {
   498  		k, v := headers[0], headers[1]
   499  		st.encodeHeaderField(k, v)
   500  		headers = headers[2:]
   501  	}
   502  	return st.headerBuf.Bytes()
   503  }
   504  
   505  // encodeHeader encodes headers and returns their HPACK bytes. headers
   506  // must contain an even number of key/value pairs. There may be
   507  // multiple pairs for keys (e.g. "cookie").  The :method, :path, and
   508  // :scheme headers default to GET, / and https. The :authority header
   509  // defaults to st.ts.Listener.Addr().
   510  func (st *serverTester) encodeHeader(headers ...string) []byte {
   511  	if len(headers)%2 == 1 {
   512  		panic("odd number of kv args")
   513  	}
   514  
   515  	st.headerBuf.Reset()
   516  	defaultAuthority := st.authority()
   517  
   518  	if len(headers) == 0 {
   519  		// Fast path, mostly for benchmarks, so test code doesn't pollute
   520  		// profiles when we're looking to improve server allocations.
   521  		st.encodeHeaderField(":method", "GET")
   522  		st.encodeHeaderField(":scheme", "https")
   523  		st.encodeHeaderField(":authority", defaultAuthority)
   524  		st.encodeHeaderField(":path", "/")
   525  		return st.headerBuf.Bytes()
   526  	}
   527  
   528  	if len(headers) == 2 && headers[0] == ":method" {
   529  		// Another fast path for benchmarks.
   530  		st.encodeHeaderField(":method", headers[1])
   531  		st.encodeHeaderField(":scheme", "https")
   532  		st.encodeHeaderField(":authority", defaultAuthority)
   533  		st.encodeHeaderField(":path", "/")
   534  		return st.headerBuf.Bytes()
   535  	}
   536  
   537  	pseudoCount := map[string]int{}
   538  	keys := []string{":method", ":scheme", ":authority", ":path"}
   539  	vals := map[string][]string{
   540  		":method":    {"GET"},
   541  		":scheme":    {"https"},
   542  		":authority": {defaultAuthority},
   543  		":path":      {"/"},
   544  	}
   545  	for len(headers) > 0 {
   546  		k, v := headers[0], headers[1]
   547  		headers = headers[2:]
   548  		if _, ok := vals[k]; !ok {
   549  			keys = append(keys, k)
   550  		}
   551  		if strings.HasPrefix(k, ":") {
   552  			pseudoCount[k]++
   553  			if pseudoCount[k] == 1 {
   554  				vals[k] = []string{v}
   555  			} else {
   556  				// Allows testing of invalid headers w/ dup pseudo fields.
   557  				vals[k] = append(vals[k], v)
   558  			}
   559  		} else {
   560  			vals[k] = append(vals[k], v)
   561  		}
   562  	}
   563  	for _, k := range keys {
   564  		for _, v := range vals[k] {
   565  			st.encodeHeaderField(k, v)
   566  		}
   567  	}
   568  	return st.headerBuf.Bytes()
   569  }
   570  
   571  // bodylessReq1 writes a HEADERS frames with StreamID 1 and EndStream and EndHeaders set.
   572  func (st *serverTester) bodylessReq1(headers ...string) {
   573  	st.writeHeaders(HeadersFrameParam{
   574  		StreamID:      1, // clients send odd numbers
   575  		BlockFragment: st.encodeHeader(headers...),
   576  		EndStream:     true,
   577  		EndHeaders:    true,
   578  	})
   579  }
   580  
   581  func (st *serverTester) wantConnFlowControlConsumed(consumed int32) {
   582  	if got, want := st.sc.TestFlowControlConsumed(), consumed; got != want {
   583  		st.t.Errorf("connection flow control consumed: %v, want %v", got, want)
   584  	}
   585  }
   586  
   587  func TestServer(t *testing.T) { synctest.Test(t, testServer) }
   588  func testServer(t *testing.T) {
   589  	gotReq := make(chan bool, 1)
   590  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
   591  		w.Header().Set("Foo", "Bar")
   592  		gotReq <- true
   593  	})
   594  	defer st.Close()
   595  
   596  	st.greet()
   597  	st.writeHeaders(HeadersFrameParam{
   598  		StreamID:      1, // clients send odd numbers
   599  		BlockFragment: st.encodeHeader(),
   600  		EndStream:     true, // no DATA frames
   601  		EndHeaders:    true,
   602  	})
   603  
   604  	<-gotReq
   605  }
   606  
   607  func TestServer_Request_Get(t *testing.T) { synctest.Test(t, testServer_Request_Get) }
   608  func testServer_Request_Get(t *testing.T) {
   609  	testServerRequest(t, func(st *serverTester) {
   610  		st.writeHeaders(HeadersFrameParam{
   611  			StreamID:      1, // clients send odd numbers
   612  			BlockFragment: st.encodeHeader("foo-bar", "some-value"),
   613  			EndStream:     true, // no DATA frames
   614  			EndHeaders:    true,
   615  		})
   616  	}, func(r *http.Request) {
   617  		if r.Method != "GET" {
   618  			t.Errorf("Method = %q; want GET", r.Method)
   619  		}
   620  		if r.URL.Path != "/" {
   621  			t.Errorf("URL.Path = %q; want /", r.URL.Path)
   622  		}
   623  		if r.ContentLength != 0 {
   624  			t.Errorf("ContentLength = %v; want 0", r.ContentLength)
   625  		}
   626  		if r.Close {
   627  			t.Error("Close = true; want false")
   628  		}
   629  		if !strings.Contains(r.RemoteAddr, ":") {
   630  			t.Errorf("RemoteAddr = %q; want something with a colon", r.RemoteAddr)
   631  		}
   632  		if r.Proto != "HTTP/2.0" || r.ProtoMajor != 2 || r.ProtoMinor != 0 {
   633  			t.Errorf("Proto = %q Major=%v,Minor=%v; want HTTP/2.0", r.Proto, r.ProtoMajor, r.ProtoMinor)
   634  		}
   635  		wantHeader := http.Header{
   636  			"Foo-Bar": []string{"some-value"},
   637  		}
   638  		if !reflect.DeepEqual(r.Header, wantHeader) {
   639  			t.Errorf("Header = %#v; want %#v", r.Header, wantHeader)
   640  		}
   641  		if n, err := r.Body.Read([]byte(" ")); err != io.EOF || n != 0 {
   642  			t.Errorf("Read = %d, %v; want 0, EOF", n, err)
   643  		}
   644  	})
   645  }
   646  
   647  func TestServer_Request_Get_PathSlashes(t *testing.T) {
   648  	synctest.Test(t, testServer_Request_Get_PathSlashes)
   649  }
   650  func testServer_Request_Get_PathSlashes(t *testing.T) {
   651  	testServerRequest(t, func(st *serverTester) {
   652  		st.writeHeaders(HeadersFrameParam{
   653  			StreamID:      1, // clients send odd numbers
   654  			BlockFragment: st.encodeHeader(":path", "/%2f/"),
   655  			EndStream:     true, // no DATA frames
   656  			EndHeaders:    true,
   657  		})
   658  	}, func(r *http.Request) {
   659  		if r.RequestURI != "/%2f/" {
   660  			t.Errorf("RequestURI = %q; want /%%2f/", r.RequestURI)
   661  		}
   662  		if r.URL.Path != "///" {
   663  			t.Errorf("URL.Path = %q; want ///", r.URL.Path)
   664  		}
   665  	})
   666  }
   667  
   668  // TODO: add a test with EndStream=true on the HEADERS but setting a
   669  // Content-Length anyway. Should we just omit it and force it to
   670  // zero?
   671  
   672  func TestServer_Request_Post_NoContentLength_EndStream(t *testing.T) {
   673  	synctest.Test(t, testServer_Request_Post_NoContentLength_EndStream)
   674  }
   675  func testServer_Request_Post_NoContentLength_EndStream(t *testing.T) {
   676  	testServerRequest(t, func(st *serverTester) {
   677  		st.writeHeaders(HeadersFrameParam{
   678  			StreamID:      1, // clients send odd numbers
   679  			BlockFragment: st.encodeHeader(":method", "POST"),
   680  			EndStream:     true,
   681  			EndHeaders:    true,
   682  		})
   683  	}, func(r *http.Request) {
   684  		if r.Method != "POST" {
   685  			t.Errorf("Method = %q; want POST", r.Method)
   686  		}
   687  		if r.ContentLength != 0 {
   688  			t.Errorf("ContentLength = %v; want 0", r.ContentLength)
   689  		}
   690  		if n, err := r.Body.Read([]byte(" ")); err != io.EOF || n != 0 {
   691  			t.Errorf("Read = %d, %v; want 0, EOF", n, err)
   692  		}
   693  	})
   694  }
   695  
   696  func TestServer_Request_Post_Body_ImmediateEOF(t *testing.T) {
   697  	synctest.Test(t, testServer_Request_Post_Body_ImmediateEOF)
   698  }
   699  func testServer_Request_Post_Body_ImmediateEOF(t *testing.T) {
   700  	testBodyContents(t, -1, "", func(st *serverTester) {
   701  		st.writeHeaders(HeadersFrameParam{
   702  			StreamID:      1, // clients send odd numbers
   703  			BlockFragment: st.encodeHeader(":method", "POST"),
   704  			EndStream:     false, // to say DATA frames are coming
   705  			EndHeaders:    true,
   706  		})
   707  		st.writeData(1, true, nil) // just kidding. empty body.
   708  	})
   709  }
   710  
   711  func TestServer_Request_Post_Body_OneData(t *testing.T) {
   712  	synctest.Test(t, testServer_Request_Post_Body_OneData)
   713  }
   714  func testServer_Request_Post_Body_OneData(t *testing.T) {
   715  	const content = "Some content"
   716  	testBodyContents(t, -1, content, func(st *serverTester) {
   717  		st.writeHeaders(HeadersFrameParam{
   718  			StreamID:      1, // clients send odd numbers
   719  			BlockFragment: st.encodeHeader(":method", "POST"),
   720  			EndStream:     false, // to say DATA frames are coming
   721  			EndHeaders:    true,
   722  		})
   723  		st.writeData(1, true, []byte(content))
   724  	})
   725  }
   726  
   727  func TestServer_Request_Post_Body_TwoData(t *testing.T) {
   728  	synctest.Test(t, testServer_Request_Post_Body_TwoData)
   729  }
   730  func testServer_Request_Post_Body_TwoData(t *testing.T) {
   731  	const content = "Some content"
   732  	testBodyContents(t, -1, content, func(st *serverTester) {
   733  		st.writeHeaders(HeadersFrameParam{
   734  			StreamID:      1, // clients send odd numbers
   735  			BlockFragment: st.encodeHeader(":method", "POST"),
   736  			EndStream:     false, // to say DATA frames are coming
   737  			EndHeaders:    true,
   738  		})
   739  		st.writeData(1, false, []byte(content[:5]))
   740  		st.writeData(1, true, []byte(content[5:]))
   741  	})
   742  }
   743  
   744  func TestServer_Request_Post_Body_ContentLength_Correct(t *testing.T) {
   745  	synctest.Test(t, testServer_Request_Post_Body_ContentLength_Correct)
   746  }
   747  func testServer_Request_Post_Body_ContentLength_Correct(t *testing.T) {
   748  	const content = "Some content"
   749  	testBodyContents(t, int64(len(content)), content, func(st *serverTester) {
   750  		st.writeHeaders(HeadersFrameParam{
   751  			StreamID: 1, // clients send odd numbers
   752  			BlockFragment: st.encodeHeader(
   753  				":method", "POST",
   754  				"content-length", strconv.Itoa(len(content)),
   755  			),
   756  			EndStream:  false, // to say DATA frames are coming
   757  			EndHeaders: true,
   758  		})
   759  		st.writeData(1, true, []byte(content))
   760  	})
   761  }
   762  
   763  func TestServer_Request_Post_Body_ContentLength_TooLarge(t *testing.T) {
   764  	synctest.Test(t, testServer_Request_Post_Body_ContentLength_TooLarge)
   765  }
   766  func testServer_Request_Post_Body_ContentLength_TooLarge(t *testing.T) {
   767  	testBodyContentsFail(t, 3, "request declared a Content-Length of 3 but only wrote 2 bytes",
   768  		func(st *serverTester) {
   769  			st.writeHeaders(HeadersFrameParam{
   770  				StreamID: 1, // clients send odd numbers
   771  				BlockFragment: st.encodeHeader(
   772  					":method", "POST",
   773  					"content-length", "3",
   774  				),
   775  				EndStream:  false, // to say DATA frames are coming
   776  				EndHeaders: true,
   777  			})
   778  			st.writeData(1, true, []byte("12"))
   779  		})
   780  }
   781  
   782  func TestServer_Request_Post_Body_ContentLength_EndStream(t *testing.T) {
   783  	testRejectRequest(t, func(st *serverTester) {
   784  		st.writeHeaders(HeadersFrameParam{
   785  			StreamID: 1, // clients send odd numbers
   786  			BlockFragment: st.encodeHeader(
   787  				":method", "POST",
   788  				"content-length", "3",
   789  			),
   790  			EndStream:  true,
   791  			EndHeaders: true,
   792  		})
   793  	})
   794  }
   795  
   796  func TestServer_Request_Post_Body_ContentLength_TooSmall(t *testing.T) {
   797  	synctest.Test(t, testServer_Request_Post_Body_ContentLength_TooSmall)
   798  }
   799  func testServer_Request_Post_Body_ContentLength_TooSmall(t *testing.T) {
   800  	testBodyContentsFail(t, 4, "sender tried to send more than declared Content-Length of 4 bytes",
   801  		func(st *serverTester) {
   802  			st.writeHeaders(HeadersFrameParam{
   803  				StreamID: 1, // clients send odd numbers
   804  				BlockFragment: st.encodeHeader(
   805  					":method", "POST",
   806  					"content-length", "4",
   807  				),
   808  				EndStream:  false, // to say DATA frames are coming
   809  				EndHeaders: true,
   810  			})
   811  			st.writeData(1, true, []byte("12345"))
   812  			// Return flow control bytes back, since the data handler closed
   813  			// the stream.
   814  			st.wantRSTStream(1, ErrCodeProtocol)
   815  			st.wantConnFlowControlConsumed(0)
   816  		})
   817  }
   818  
   819  func testBodyContents(t *testing.T, wantContentLength int64, wantBody string, write func(st *serverTester)) {
   820  	testServerRequest(t, write, func(r *http.Request) {
   821  		if r.Method != "POST" {
   822  			t.Errorf("Method = %q; want POST", r.Method)
   823  		}
   824  		if r.ContentLength != wantContentLength {
   825  			t.Errorf("ContentLength = %v; want %d", r.ContentLength, wantContentLength)
   826  		}
   827  		all, err := io.ReadAll(r.Body)
   828  		if err != nil {
   829  			t.Fatal(err)
   830  		}
   831  		if string(all) != wantBody {
   832  			t.Errorf("Read = %q; want %q", all, wantBody)
   833  		}
   834  		if err := r.Body.Close(); err != nil {
   835  			t.Fatalf("Close: %v", err)
   836  		}
   837  	})
   838  }
   839  
   840  func testBodyContentsFail(t *testing.T, wantContentLength int64, wantReadError string, write func(st *serverTester)) {
   841  	testServerRequest(t, write, func(r *http.Request) {
   842  		if r.Method != "POST" {
   843  			t.Errorf("Method = %q; want POST", r.Method)
   844  		}
   845  		if r.ContentLength != wantContentLength {
   846  			t.Errorf("ContentLength = %v; want %d", r.ContentLength, wantContentLength)
   847  		}
   848  		all, err := io.ReadAll(r.Body)
   849  		if err == nil {
   850  			t.Fatalf("expected an error (%q) reading from the body. Successfully read %q instead.",
   851  				wantReadError, all)
   852  		}
   853  		if !strings.Contains(err.Error(), wantReadError) {
   854  			t.Fatalf("Body.Read = %v; want substring %q", err, wantReadError)
   855  		}
   856  		if err := r.Body.Close(); err != nil {
   857  			t.Fatalf("Close: %v", err)
   858  		}
   859  	})
   860  }
   861  
   862  // Using a Host header, instead of :authority
   863  func TestServer_Request_Get_Host(t *testing.T) { synctest.Test(t, testServer_Request_Get_Host) }
   864  func testServer_Request_Get_Host(t *testing.T) {
   865  	const host = "example.com"
   866  	testServerRequest(t, func(st *serverTester) {
   867  		st.writeHeaders(HeadersFrameParam{
   868  			StreamID:      1, // clients send odd numbers
   869  			BlockFragment: st.encodeHeader(":authority", "", "host", host),
   870  			EndStream:     true,
   871  			EndHeaders:    true,
   872  		})
   873  	}, func(r *http.Request) {
   874  		if r.Host != host {
   875  			t.Errorf("Host = %q; want %q", r.Host, host)
   876  		}
   877  	})
   878  }
   879  
   880  // Using an :authority pseudo-header, instead of Host
   881  func TestServer_Request_Get_Authority(t *testing.T) {
   882  	synctest.Test(t, testServer_Request_Get_Authority)
   883  }
   884  func testServer_Request_Get_Authority(t *testing.T) {
   885  	const host = "example.com"
   886  	testServerRequest(t, func(st *serverTester) {
   887  		st.writeHeaders(HeadersFrameParam{
   888  			StreamID:      1, // clients send odd numbers
   889  			BlockFragment: st.encodeHeader(":authority", host),
   890  			EndStream:     true,
   891  			EndHeaders:    true,
   892  		})
   893  	}, func(r *http.Request) {
   894  		if r.Host != host {
   895  			t.Errorf("Host = %q; want %q", r.Host, host)
   896  		}
   897  	})
   898  }
   899  
   900  func TestServer_Request_WithContinuation(t *testing.T) {
   901  	synctest.Test(t, testServer_Request_WithContinuation)
   902  }
   903  func testServer_Request_WithContinuation(t *testing.T) {
   904  	wantHeader := http.Header{
   905  		"Foo-One":   []string{"value-one"},
   906  		"Foo-Two":   []string{"value-two"},
   907  		"Foo-Three": []string{"value-three"},
   908  	}
   909  	testServerRequest(t, func(st *serverTester) {
   910  		fullHeaders := st.encodeHeader(
   911  			"foo-one", "value-one",
   912  			"foo-two", "value-two",
   913  			"foo-three", "value-three",
   914  		)
   915  		remain := fullHeaders
   916  		chunks := 0
   917  		for len(remain) > 0 {
   918  			const maxChunkSize = 5
   919  			chunk := remain
   920  			if len(chunk) > maxChunkSize {
   921  				chunk = chunk[:maxChunkSize]
   922  			}
   923  			remain = remain[len(chunk):]
   924  
   925  			if chunks == 0 {
   926  				st.writeHeaders(HeadersFrameParam{
   927  					StreamID:      1, // clients send odd numbers
   928  					BlockFragment: chunk,
   929  					EndStream:     true,  // no DATA frames
   930  					EndHeaders:    false, // we'll have continuation frames
   931  				})
   932  			} else {
   933  				err := st.fr.WriteContinuation(1, len(remain) == 0, chunk)
   934  				if err != nil {
   935  					t.Fatal(err)
   936  				}
   937  			}
   938  			chunks++
   939  		}
   940  		if chunks < 2 {
   941  			t.Fatal("too few chunks")
   942  		}
   943  	}, func(r *http.Request) {
   944  		if !reflect.DeepEqual(r.Header, wantHeader) {
   945  			t.Errorf("Header = %#v; want %#v", r.Header, wantHeader)
   946  		}
   947  	})
   948  }
   949  
   950  // Concatenated cookie headers. ("8.1.2.5 Compressing the Cookie Header Field")
   951  func TestServer_Request_CookieConcat(t *testing.T) { synctest.Test(t, testServer_Request_CookieConcat) }
   952  func testServer_Request_CookieConcat(t *testing.T) {
   953  	const host = "example.com"
   954  	testServerRequest(t, func(st *serverTester) {
   955  		st.bodylessReq1(
   956  			":authority", host,
   957  			"cookie", "a=b",
   958  			"cookie", "c=d",
   959  			"cookie", "e=f",
   960  		)
   961  	}, func(r *http.Request) {
   962  		const want = "a=b; c=d; e=f"
   963  		if got := r.Header.Get("Cookie"); got != want {
   964  			t.Errorf("Cookie = %q; want %q", got, want)
   965  		}
   966  	})
   967  }
   968  
   969  func TestServer_Request_Reject_CapitalHeader(t *testing.T) {
   970  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1("UPPER", "v") })
   971  }
   972  
   973  func TestServer_Request_Reject_HeaderFieldNameColon(t *testing.T) {
   974  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1("has:colon", "v") })
   975  }
   976  
   977  func TestServer_Request_Reject_HeaderFieldNameNULL(t *testing.T) {
   978  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1("has\x00null", "v") })
   979  }
   980  
   981  func TestServer_Request_Reject_HeaderFieldNameEmpty(t *testing.T) {
   982  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1("", "v") })
   983  }
   984  
   985  func TestServer_Request_Reject_HeaderFieldValueNewline(t *testing.T) {
   986  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1("foo", "has\nnewline") })
   987  }
   988  
   989  func TestServer_Request_Reject_HeaderFieldValueCR(t *testing.T) {
   990  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1("foo", "has\rcarriage") })
   991  }
   992  
   993  func TestServer_Request_Reject_HeaderFieldValueDEL(t *testing.T) {
   994  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1("foo", "has\x7fdel") })
   995  }
   996  
   997  func TestServer_Request_Reject_Pseudo_Missing_method(t *testing.T) {
   998  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1(":method", "") })
   999  }
  1000  
  1001  func TestServer_Request_Reject_Pseudo_ExactlyOne(t *testing.T) {
  1002  	// 8.1.2.3 Request Pseudo-Header Fields
  1003  	// "All HTTP/2 requests MUST include exactly one valid value" ...
  1004  	testRejectRequest(t, func(st *serverTester) {
  1005  		st.addLogFilter("duplicate pseudo-header")
  1006  		st.bodylessReq1(":method", "GET", ":method", "POST")
  1007  	})
  1008  }
  1009  
  1010  func TestServer_Request_Reject_Pseudo_AfterRegular(t *testing.T) {
  1011  	// 8.1.2.3 Request Pseudo-Header Fields
  1012  	// "All pseudo-header fields MUST appear in the header block
  1013  	// before regular header fields. Any request or response that
  1014  	// contains a pseudo-header field that appears in a header
  1015  	// block after a regular header field MUST be treated as
  1016  	// malformed (Section 8.1.2.6)."
  1017  	testRejectRequest(t, func(st *serverTester) {
  1018  		st.addLogFilter("pseudo-header after regular header")
  1019  		var buf bytes.Buffer
  1020  		enc := hpack.NewEncoder(&buf)
  1021  		enc.WriteField(hpack.HeaderField{Name: ":method", Value: "GET"})
  1022  		enc.WriteField(hpack.HeaderField{Name: "regular", Value: "foobar"})
  1023  		enc.WriteField(hpack.HeaderField{Name: ":path", Value: "/"})
  1024  		enc.WriteField(hpack.HeaderField{Name: ":scheme", Value: "https"})
  1025  		st.writeHeaders(HeadersFrameParam{
  1026  			StreamID:      1, // clients send odd numbers
  1027  			BlockFragment: buf.Bytes(),
  1028  			EndStream:     true,
  1029  			EndHeaders:    true,
  1030  		})
  1031  	})
  1032  }
  1033  
  1034  func TestServer_Request_Reject_Pseudo_Missing_path(t *testing.T) {
  1035  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1(":path", "") })
  1036  }
  1037  
  1038  func TestServer_Request_Reject_Pseudo_Missing_scheme(t *testing.T) {
  1039  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1(":scheme", "") })
  1040  }
  1041  
  1042  func TestServer_Request_Reject_Pseudo_scheme_invalid(t *testing.T) {
  1043  	testRejectRequest(t, func(st *serverTester) { st.bodylessReq1(":scheme", "bogus") })
  1044  }
  1045  
  1046  func TestServer_Request_Reject_Pseudo_Unknown(t *testing.T) {
  1047  	testRejectRequest(t, func(st *serverTester) {
  1048  		st.addLogFilter(`invalid pseudo-header ":unknown_thing"`)
  1049  		st.bodylessReq1(":unknown_thing", "")
  1050  	})
  1051  }
  1052  
  1053  func TestServer_Request_Reject_Authority_Userinfo(t *testing.T) {
  1054  	// "':authority' MUST NOT include the deprecated userinfo subcomponent
  1055  	// for "http" or "https" schemed URIs."
  1056  	// https://www.rfc-editor.org/rfc/rfc9113.html#section-8.3.1-2.3.8
  1057  	testRejectRequest(t, func(st *serverTester) {
  1058  		var buf bytes.Buffer
  1059  		enc := hpack.NewEncoder(&buf)
  1060  		enc.WriteField(hpack.HeaderField{Name: ":authority", Value: "userinfo@example.tld"})
  1061  		enc.WriteField(hpack.HeaderField{Name: ":method", Value: "GET"})
  1062  		enc.WriteField(hpack.HeaderField{Name: ":path", Value: "/"})
  1063  		enc.WriteField(hpack.HeaderField{Name: ":scheme", Value: "https"})
  1064  		st.writeHeaders(HeadersFrameParam{
  1065  			StreamID:      1, // clients send odd numbers
  1066  			BlockFragment: buf.Bytes(),
  1067  			EndStream:     true,
  1068  			EndHeaders:    true,
  1069  		})
  1070  	})
  1071  }
  1072  
  1073  func testRejectRequest(t *testing.T, send func(*serverTester)) {
  1074  	synctest.Test(t, func(t *testing.T) {
  1075  		st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1076  			t.Error("server request made it to handler; should've been rejected")
  1077  		})
  1078  		defer st.Close()
  1079  
  1080  		st.greet()
  1081  		send(st)
  1082  		st.wantRSTStream(1, ErrCodeProtocol)
  1083  	})
  1084  }
  1085  
  1086  func newServerTesterForError(t *testing.T) *serverTester {
  1087  	t.Helper()
  1088  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1089  		t.Error("server request made it to handler; should've been rejected")
  1090  	}, optQuiet)
  1091  	st.greet()
  1092  	return st
  1093  }
  1094  
  1095  // Section 5.1, on idle connections: "Receiving any frame other than
  1096  // HEADERS or PRIORITY on a stream in this state MUST be treated as a
  1097  // connection error (Section 5.4.1) of type PROTOCOL_ERROR."
  1098  func TestRejectFrameOnIdle_WindowUpdate(t *testing.T) {
  1099  	synctest.Test(t, testRejectFrameOnIdle_WindowUpdate)
  1100  }
  1101  func testRejectFrameOnIdle_WindowUpdate(t *testing.T) {
  1102  	st := newServerTesterForError(t)
  1103  	st.fr.WriteWindowUpdate(123, 456)
  1104  	st.wantGoAway(123, ErrCodeProtocol)
  1105  }
  1106  func TestRejectFrameOnIdle_Data(t *testing.T) { synctest.Test(t, testRejectFrameOnIdle_Data) }
  1107  func testRejectFrameOnIdle_Data(t *testing.T) {
  1108  	st := newServerTesterForError(t)
  1109  	st.fr.WriteData(123, true, nil)
  1110  	st.wantGoAway(123, ErrCodeProtocol)
  1111  }
  1112  func TestRejectFrameOnIdle_RSTStream(t *testing.T) { synctest.Test(t, testRejectFrameOnIdle_RSTStream) }
  1113  func testRejectFrameOnIdle_RSTStream(t *testing.T) {
  1114  	st := newServerTesterForError(t)
  1115  	st.fr.WriteRSTStream(123, ErrCodeCancel)
  1116  	st.wantGoAway(123, ErrCodeProtocol)
  1117  }
  1118  
  1119  func TestServer_Request_Connect(t *testing.T) { synctest.Test(t, testServer_Request_Connect) }
  1120  func testServer_Request_Connect(t *testing.T) {
  1121  	testServerRequest(t, func(st *serverTester) {
  1122  		st.writeHeaders(HeadersFrameParam{
  1123  			StreamID: 1,
  1124  			BlockFragment: st.encodeHeaderRaw(
  1125  				":method", "CONNECT",
  1126  				":authority", "example.com:123",
  1127  			),
  1128  			EndStream:  true,
  1129  			EndHeaders: true,
  1130  		})
  1131  	}, func(r *http.Request) {
  1132  		if g, w := r.Method, "CONNECT"; g != w {
  1133  			t.Errorf("Method = %q; want %q", g, w)
  1134  		}
  1135  		if g, w := r.RequestURI, "example.com:123"; g != w {
  1136  			t.Errorf("RequestURI = %q; want %q", g, w)
  1137  		}
  1138  		if g, w := r.URL.Host, "example.com:123"; g != w {
  1139  			t.Errorf("URL.Host = %q; want %q", g, w)
  1140  		}
  1141  	})
  1142  }
  1143  
  1144  func TestServer_Request_Connect_InvalidPath(t *testing.T) {
  1145  	synctest.Test(t, testServer_Request_Connect_InvalidPath)
  1146  }
  1147  func testServer_Request_Connect_InvalidPath(t *testing.T) {
  1148  	testServerRejectsStream(t, ErrCodeProtocol, func(st *serverTester) {
  1149  		st.writeHeaders(HeadersFrameParam{
  1150  			StreamID: 1,
  1151  			BlockFragment: st.encodeHeaderRaw(
  1152  				":method", "CONNECT",
  1153  				":authority", "example.com:123",
  1154  				":path", "/bogus",
  1155  			),
  1156  			EndStream:  true,
  1157  			EndHeaders: true,
  1158  		})
  1159  	})
  1160  }
  1161  
  1162  func TestServer_Request_Connect_InvalidScheme(t *testing.T) {
  1163  	synctest.Test(t, testServer_Request_Connect_InvalidScheme)
  1164  }
  1165  func testServer_Request_Connect_InvalidScheme(t *testing.T) {
  1166  	testServerRejectsStream(t, ErrCodeProtocol, func(st *serverTester) {
  1167  		st.writeHeaders(HeadersFrameParam{
  1168  			StreamID: 1,
  1169  			BlockFragment: st.encodeHeaderRaw(
  1170  				":method", "CONNECT",
  1171  				":authority", "example.com:123",
  1172  				":scheme", "https",
  1173  			),
  1174  			EndStream:  true,
  1175  			EndHeaders: true,
  1176  		})
  1177  	})
  1178  }
  1179  
  1180  func TestServer_Ping(t *testing.T) { synctest.Test(t, testServer_Ping) }
  1181  func testServer_Ping(t *testing.T) {
  1182  	st := newServerTester(t, nil)
  1183  	defer st.Close()
  1184  	st.greet()
  1185  
  1186  	// Server should ignore this one, since it has ACK set.
  1187  	ackPingData := [8]byte{1, 2, 4, 8, 16, 32, 64, 128}
  1188  	if err := st.fr.WritePing(true, ackPingData); err != nil {
  1189  		t.Fatal(err)
  1190  	}
  1191  
  1192  	// But the server should reply to this one, since ACK is false.
  1193  	pingData := [8]byte{1, 2, 3, 4, 5, 6, 7, 8}
  1194  	if err := st.fr.WritePing(false, pingData); err != nil {
  1195  		t.Fatal(err)
  1196  	}
  1197  
  1198  	pf := readFrame[*PingFrame](t, st)
  1199  	if !pf.Flags.Has(FlagPingAck) {
  1200  		t.Error("response ping doesn't have ACK set")
  1201  	}
  1202  	if pf.Data != pingData {
  1203  		t.Errorf("response ping has data %q; want %q", pf.Data, pingData)
  1204  	}
  1205  }
  1206  
  1207  type filterListener struct {
  1208  	net.Listener
  1209  	accept func(conn net.Conn) (net.Conn, error)
  1210  }
  1211  
  1212  func (l *filterListener) Accept() (net.Conn, error) {
  1213  	c, err := l.Listener.Accept()
  1214  	if err != nil {
  1215  		return nil, err
  1216  	}
  1217  	return l.accept(c)
  1218  }
  1219  
  1220  func TestServer_MaxQueuedControlFrames(t *testing.T) {
  1221  	synctest.Test(t, testServer_MaxQueuedControlFrames)
  1222  }
  1223  func testServer_MaxQueuedControlFrames(t *testing.T) {
  1224  	// Goroutine debugging makes this test very slow.
  1225  	DisableGoroutineTracking(t)
  1226  
  1227  	st := newServerTester(t, nil)
  1228  	st.greet()
  1229  
  1230  	st.cc.(*tls.Conn).NetConn().(*synctestNetConn).SetReadBufferSize(0) // all writes block
  1231  
  1232  	// Send maxQueuedControlFrames pings, plus a few extra
  1233  	// to account for ones that enter the server's write buffer.
  1234  	const extraPings = 2
  1235  	for range MaxQueuedControlFrames + extraPings {
  1236  		pingData := [8]byte{1, 2, 3, 4, 5, 6, 7, 8}
  1237  		st.fr.WritePing(false, pingData)
  1238  	}
  1239  	synctest.Wait()
  1240  
  1241  	// Unblock the server.
  1242  	// It should have closed the connection after exceeding the control frame limit.
  1243  	st.cc.(*tls.Conn).NetConn().(*synctestNetConn).SetReadBufferSize(math.MaxInt)
  1244  
  1245  	st.advance(GoAwayTimeout)
  1246  	// Some frames may have persisted in the server's buffers.
  1247  	for range 10 {
  1248  		if st.readFrame() == nil {
  1249  			break
  1250  		}
  1251  	}
  1252  	st.wantClosed()
  1253  }
  1254  
  1255  func TestServer_RejectsLargeFrames(t *testing.T) { synctest.Test(t, testServer_RejectsLargeFrames) }
  1256  func testServer_RejectsLargeFrames(t *testing.T) {
  1257  	if runtime.GOOS == "windows" || runtime.GOOS == "plan9" || runtime.GOOS == "zos" {
  1258  		t.Skip("see golang.org/issue/13434, golang.org/issue/37321")
  1259  	}
  1260  	st := newServerTester(t, nil)
  1261  	defer st.Close()
  1262  	st.greet()
  1263  
  1264  	// Write too large of a frame (too large by one byte)
  1265  	// We ignore the return value because it's expected that the server
  1266  	// will only read the first 9 bytes (the headre) and then disconnect.
  1267  	st.fr.WriteRawFrame(0xff, 0, 0, make([]byte, DefaultMaxReadFrameSize+1))
  1268  
  1269  	st.wantGoAway(0, ErrCodeFrameSize)
  1270  	st.advance(GoAwayTimeout)
  1271  	st.wantClosed()
  1272  }
  1273  
  1274  func TestServer_Handler_Sends_WindowUpdate(t *testing.T) {
  1275  	synctest.Test(t, testServer_Handler_Sends_WindowUpdate)
  1276  }
  1277  func testServer_Handler_Sends_WindowUpdate(t *testing.T) {
  1278  	// Need to set this to at least twice the initial window size,
  1279  	// or st.greet gets stuck waiting for a WINDOW_UPDATE.
  1280  	//
  1281  	// This also needs to be less than MAX_FRAME_SIZE.
  1282  	const windowSize = 65535 * 2
  1283  	st := newServerTester(t, nil, func(h2 *http.HTTP2Config) {
  1284  		h2.MaxReceiveBufferPerConnection = windowSize
  1285  		h2.MaxReceiveBufferPerStream = windowSize
  1286  	})
  1287  	defer st.Close()
  1288  
  1289  	st.greet()
  1290  	st.writeHeaders(HeadersFrameParam{
  1291  		StreamID:      1, // clients send odd numbers
  1292  		BlockFragment: st.encodeHeader(":method", "POST"),
  1293  		EndStream:     false, // data coming
  1294  		EndHeaders:    true,
  1295  	})
  1296  	call := st.nextHandlerCall()
  1297  
  1298  	// Write less than half the max window of data and consume it.
  1299  	// The server doesn't return flow control yet, buffering the 1024 bytes to
  1300  	// combine with a future update.
  1301  	data := make([]byte, windowSize)
  1302  	st.writeData(1, false, data[:1024])
  1303  	call.do(readBodyHandler(t, string(data[:1024])))
  1304  
  1305  	// Write up to the window limit.
  1306  	// The server returns the buffered credit.
  1307  	st.writeData(1, false, data[1024:])
  1308  	st.wantWindowUpdate(0, 1024)
  1309  	st.wantWindowUpdate(1, 1024)
  1310  
  1311  	// The handler consumes the data and the server returns credit.
  1312  	call.do(readBodyHandler(t, string(data[1024:])))
  1313  	st.wantWindowUpdate(0, windowSize-1024)
  1314  	st.wantWindowUpdate(1, windowSize-1024)
  1315  }
  1316  
  1317  // the version of the TestServer_Handler_Sends_WindowUpdate with padding.
  1318  // See golang.org/issue/16556
  1319  func TestServer_Handler_Sends_WindowUpdate_Padding(t *testing.T) {
  1320  	synctest.Test(t, testServer_Handler_Sends_WindowUpdate_Padding)
  1321  }
  1322  func testServer_Handler_Sends_WindowUpdate_Padding(t *testing.T) {
  1323  	const windowSize = 65535 * 2
  1324  	st := newServerTester(t, nil, func(h2 *http.HTTP2Config) {
  1325  		h2.MaxReceiveBufferPerConnection = windowSize
  1326  		h2.MaxReceiveBufferPerStream = windowSize
  1327  	})
  1328  	defer st.Close()
  1329  
  1330  	st.greet()
  1331  	st.writeHeaders(HeadersFrameParam{
  1332  		StreamID:      1,
  1333  		BlockFragment: st.encodeHeader(":method", "POST"),
  1334  		EndStream:     false,
  1335  		EndHeaders:    true,
  1336  	})
  1337  	call := st.nextHandlerCall()
  1338  
  1339  	// Write half a window of data, with some padding.
  1340  	// The server doesn't return the padding yet, buffering the 5 bytes to combine
  1341  	// with a future update.
  1342  	data := make([]byte, windowSize/2)
  1343  	pad := make([]byte, 4)
  1344  	st.writeDataPadded(1, false, data, pad)
  1345  
  1346  	// The handler consumes the body.
  1347  	// The server returns flow control for the body and padding
  1348  	// (4 bytes of padding + 1 byte of length).
  1349  	call.do(readBodyHandler(t, string(data)))
  1350  	st.wantWindowUpdate(0, uint32(len(data)+1+len(pad)))
  1351  	st.wantWindowUpdate(1, uint32(len(data)+1+len(pad)))
  1352  }
  1353  
  1354  func TestServer_Send_GoAway_After_Bogus_WindowUpdate(t *testing.T) {
  1355  	synctest.Test(t, testServer_Send_GoAway_After_Bogus_WindowUpdate)
  1356  }
  1357  func testServer_Send_GoAway_After_Bogus_WindowUpdate(t *testing.T) {
  1358  	st := newServerTester(t, nil)
  1359  	defer st.Close()
  1360  	st.greet()
  1361  	if err := st.fr.WriteWindowUpdate(0, 1<<31-1); err != nil {
  1362  		t.Fatal(err)
  1363  	}
  1364  	st.wantGoAway(0, ErrCodeFlowControl)
  1365  }
  1366  
  1367  func TestServer_Send_RstStream_After_Bogus_WindowUpdate(t *testing.T) {
  1368  	synctest.Test(t, testServer_Send_RstStream_After_Bogus_WindowUpdate)
  1369  }
  1370  func testServer_Send_RstStream_After_Bogus_WindowUpdate(t *testing.T) {
  1371  	inHandler := make(chan bool)
  1372  	blockHandler := make(chan bool)
  1373  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1374  		inHandler <- true
  1375  		<-blockHandler
  1376  	})
  1377  	defer st.Close()
  1378  	defer close(blockHandler)
  1379  	st.greet()
  1380  	st.writeHeaders(HeadersFrameParam{
  1381  		StreamID:      1,
  1382  		BlockFragment: st.encodeHeader(":method", "POST"),
  1383  		EndStream:     false, // keep it open
  1384  		EndHeaders:    true,
  1385  	})
  1386  	<-inHandler
  1387  	// Send a bogus window update:
  1388  	if err := st.fr.WriteWindowUpdate(1, 1<<31-1); err != nil {
  1389  		t.Fatal(err)
  1390  	}
  1391  	st.wantRSTStream(1, ErrCodeFlowControl)
  1392  }
  1393  
  1394  // testServerPostUnblock sends a hanging POST with unsent data to handler,
  1395  // then runs fn once in the handler, and verifies that the error returned from
  1396  // handler is acceptable. It fails if takes over 5 seconds for handler to exit.
  1397  func testServerPostUnblock(t *testing.T,
  1398  	handler func(http.ResponseWriter, *http.Request) error,
  1399  	fn func(*serverTester),
  1400  	checkErr func(error),
  1401  	otherHeaders ...string) {
  1402  	inHandler := make(chan bool)
  1403  	errc := make(chan error, 1)
  1404  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1405  		inHandler <- true
  1406  		errc <- handler(w, r)
  1407  	})
  1408  	defer st.Close()
  1409  	st.greet()
  1410  	st.writeHeaders(HeadersFrameParam{
  1411  		StreamID:      1,
  1412  		BlockFragment: st.encodeHeader(append([]string{":method", "POST"}, otherHeaders...)...),
  1413  		EndStream:     false, // keep it open
  1414  		EndHeaders:    true,
  1415  	})
  1416  	<-inHandler
  1417  	fn(st)
  1418  	err := <-errc
  1419  	if checkErr != nil {
  1420  		checkErr(err)
  1421  	}
  1422  }
  1423  
  1424  func TestServer_RSTStream_Unblocks_Read(t *testing.T) {
  1425  	synctest.Test(t, testServer_RSTStream_Unblocks_Read)
  1426  }
  1427  func testServer_RSTStream_Unblocks_Read(t *testing.T) {
  1428  	testServerPostUnblock(t,
  1429  		func(w http.ResponseWriter, r *http.Request) (err error) {
  1430  			_, err = r.Body.Read(make([]byte, 1))
  1431  			return
  1432  		},
  1433  		func(st *serverTester) {
  1434  			if err := st.fr.WriteRSTStream(1, ErrCodeCancel); err != nil {
  1435  				t.Fatal(err)
  1436  			}
  1437  		},
  1438  		func(err error) {
  1439  			want := StreamError{StreamID: 0x1, Code: 0x8}
  1440  			if !reflect.DeepEqual(err, want) {
  1441  				t.Errorf("Read error = %v; want %v", err, want)
  1442  			}
  1443  		},
  1444  	)
  1445  }
  1446  
  1447  func TestServer_RSTStream_Unblocks_Header_Write(t *testing.T) {
  1448  	// Run this test a bunch, because it doesn't always
  1449  	// deadlock. But with a bunch, it did.
  1450  	n := 50
  1451  	if testing.Short() {
  1452  		n = 5
  1453  	}
  1454  	for i := 0; i < n; i++ {
  1455  		synctest.Test(t, testServer_RSTStream_Unblocks_Header_Write)
  1456  	}
  1457  }
  1458  
  1459  func testServer_RSTStream_Unblocks_Header_Write(t *testing.T) {
  1460  	inHandler := make(chan bool, 1)
  1461  	unblockHandler := make(chan bool, 1)
  1462  	headerWritten := make(chan bool, 1)
  1463  	wroteRST := make(chan bool, 1)
  1464  
  1465  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1466  		inHandler <- true
  1467  		<-wroteRST
  1468  		w.Header().Set("foo", "bar")
  1469  		w.WriteHeader(200)
  1470  		w.(http.Flusher).Flush()
  1471  		headerWritten <- true
  1472  		<-unblockHandler
  1473  	})
  1474  	defer st.Close()
  1475  
  1476  	st.greet()
  1477  	st.writeHeaders(HeadersFrameParam{
  1478  		StreamID:      1,
  1479  		BlockFragment: st.encodeHeader(":method", "POST"),
  1480  		EndStream:     false, // keep it open
  1481  		EndHeaders:    true,
  1482  	})
  1483  	<-inHandler
  1484  	if err := st.fr.WriteRSTStream(1, ErrCodeCancel); err != nil {
  1485  		t.Fatal(err)
  1486  	}
  1487  	wroteRST <- true
  1488  	synctest.Wait()
  1489  	<-headerWritten
  1490  	unblockHandler <- true
  1491  }
  1492  
  1493  func TestServer_DeadConn_Unblocks_Read(t *testing.T) {
  1494  	synctest.Test(t, testServer_DeadConn_Unblocks_Read)
  1495  }
  1496  func testServer_DeadConn_Unblocks_Read(t *testing.T) {
  1497  	testServerPostUnblock(t,
  1498  		func(w http.ResponseWriter, r *http.Request) (err error) {
  1499  			_, err = r.Body.Read(make([]byte, 1))
  1500  			return
  1501  		},
  1502  		func(st *serverTester) { st.cc.Close() },
  1503  		func(err error) {
  1504  			if err == nil {
  1505  				t.Error("unexpected nil error from Request.Body.Read")
  1506  			}
  1507  		},
  1508  	)
  1509  }
  1510  
  1511  var blockUntilClosed = func(w http.ResponseWriter, r *http.Request) error {
  1512  	<-w.(http.CloseNotifier).CloseNotify()
  1513  	return nil
  1514  }
  1515  
  1516  func TestServer_CloseNotify_After_RSTStream(t *testing.T) {
  1517  	synctest.Test(t, testServer_CloseNotify_After_RSTStream)
  1518  }
  1519  func testServer_CloseNotify_After_RSTStream(t *testing.T) {
  1520  	testServerPostUnblock(t, blockUntilClosed, func(st *serverTester) {
  1521  		if err := st.fr.WriteRSTStream(1, ErrCodeCancel); err != nil {
  1522  			t.Fatal(err)
  1523  		}
  1524  	}, nil)
  1525  }
  1526  
  1527  func TestServer_CloseNotify_After_ConnClose(t *testing.T) {
  1528  	synctest.Test(t, testServer_CloseNotify_After_ConnClose)
  1529  }
  1530  func testServer_CloseNotify_After_ConnClose(t *testing.T) {
  1531  	testServerPostUnblock(t, blockUntilClosed, func(st *serverTester) { st.cc.Close() }, nil)
  1532  }
  1533  
  1534  // that CloseNotify unblocks after a stream error due to the client's
  1535  // problem that's unrelated to them explicitly canceling it (which is
  1536  // TestServer_CloseNotify_After_RSTStream above)
  1537  func TestServer_CloseNotify_After_StreamError(t *testing.T) {
  1538  	synctest.Test(t, testServer_CloseNotify_After_StreamError)
  1539  }
  1540  func testServer_CloseNotify_After_StreamError(t *testing.T) {
  1541  	testServerPostUnblock(t, blockUntilClosed, func(st *serverTester) {
  1542  		// data longer than declared Content-Length => stream error
  1543  		st.writeData(1, true, []byte("1234"))
  1544  	}, nil, "content-length", "3")
  1545  }
  1546  
  1547  func TestServer_StateTransitions(t *testing.T) { synctest.Test(t, testServer_StateTransitions) }
  1548  func testServer_StateTransitions(t *testing.T) {
  1549  	var st *serverTester
  1550  	inHandler := make(chan bool)
  1551  	writeData := make(chan bool)
  1552  	leaveHandler := make(chan bool)
  1553  	st = newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1554  		inHandler <- true
  1555  		if !st.streamExists(1) {
  1556  			t.Errorf("stream 1 does not exist in handler")
  1557  		}
  1558  		if got, want := st.streamState(1), StateOpen; got != want {
  1559  			t.Errorf("in handler, state is %v; want %v", got, want)
  1560  		}
  1561  		writeData <- true
  1562  		if n, err := r.Body.Read(make([]byte, 1)); n != 0 || err != io.EOF {
  1563  			t.Errorf("body read = %d, %v; want 0, EOF", n, err)
  1564  		}
  1565  		if got, want := st.streamState(1), StateHalfClosedRemote; got != want {
  1566  			t.Errorf("in handler, state is %v; want %v", got, want)
  1567  		}
  1568  
  1569  		<-leaveHandler
  1570  	})
  1571  	st.greet()
  1572  	if st.streamExists(1) {
  1573  		t.Fatal("stream 1 should be empty")
  1574  	}
  1575  	if got := st.streamState(1); got != StateIdle {
  1576  		t.Fatalf("stream 1 should be idle; got %v", got)
  1577  	}
  1578  
  1579  	st.writeHeaders(HeadersFrameParam{
  1580  		StreamID:      1,
  1581  		BlockFragment: st.encodeHeader(":method", "POST"),
  1582  		EndStream:     false, // keep it open
  1583  		EndHeaders:    true,
  1584  	})
  1585  	<-inHandler
  1586  	<-writeData
  1587  	st.writeData(1, true, nil)
  1588  
  1589  	leaveHandler <- true
  1590  	st.wantHeaders(wantHeader{
  1591  		streamID:  1,
  1592  		endStream: true,
  1593  	})
  1594  
  1595  	if got, want := st.streamState(1), StateClosed; got != want {
  1596  		t.Errorf("at end, state is %v; want %v", got, want)
  1597  	}
  1598  	if st.streamExists(1) {
  1599  		t.Fatal("at end, stream 1 should be gone")
  1600  	}
  1601  }
  1602  
  1603  // test HEADERS w/o EndHeaders + another HEADERS (should get rejected)
  1604  func TestServer_Rejects_HeadersNoEnd_Then_Headers(t *testing.T) {
  1605  	synctest.Test(t, testServer_Rejects_HeadersNoEnd_Then_Headers)
  1606  }
  1607  func testServer_Rejects_HeadersNoEnd_Then_Headers(t *testing.T) {
  1608  	st := newServerTesterForError(t)
  1609  	st.writeHeaders(HeadersFrameParam{
  1610  		StreamID:      1,
  1611  		BlockFragment: st.encodeHeader(),
  1612  		EndStream:     true,
  1613  		EndHeaders:    false,
  1614  	})
  1615  	st.writeHeaders(HeadersFrameParam{ // Not a continuation.
  1616  		StreamID:      3, // different stream.
  1617  		BlockFragment: st.encodeHeader(),
  1618  		EndStream:     true,
  1619  		EndHeaders:    true,
  1620  	})
  1621  	st.wantGoAway(0, ErrCodeProtocol)
  1622  }
  1623  
  1624  // test HEADERS w/o EndHeaders + PING (should get rejected)
  1625  func TestServer_Rejects_HeadersNoEnd_Then_Ping(t *testing.T) {
  1626  	synctest.Test(t, testServer_Rejects_HeadersNoEnd_Then_Ping)
  1627  }
  1628  func testServer_Rejects_HeadersNoEnd_Then_Ping(t *testing.T) {
  1629  	st := newServerTesterForError(t)
  1630  	st.writeHeaders(HeadersFrameParam{
  1631  		StreamID:      1,
  1632  		BlockFragment: st.encodeHeader(),
  1633  		EndStream:     true,
  1634  		EndHeaders:    false,
  1635  	})
  1636  	if err := st.fr.WritePing(false, [8]byte{}); err != nil {
  1637  		t.Fatal(err)
  1638  	}
  1639  	st.wantGoAway(0, ErrCodeProtocol)
  1640  }
  1641  
  1642  // test HEADERS w/ EndHeaders + a continuation HEADERS (should get rejected)
  1643  func TestServer_Rejects_HeadersEnd_Then_Continuation(t *testing.T) {
  1644  	synctest.Test(t, testServer_Rejects_HeadersEnd_Then_Continuation)
  1645  }
  1646  func testServer_Rejects_HeadersEnd_Then_Continuation(t *testing.T) {
  1647  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {}, optQuiet)
  1648  	st.greet()
  1649  	st.writeHeaders(HeadersFrameParam{
  1650  		StreamID:      1,
  1651  		BlockFragment: st.encodeHeader(),
  1652  		EndStream:     true,
  1653  		EndHeaders:    true,
  1654  	})
  1655  	st.wantHeaders(wantHeader{
  1656  		streamID:  1,
  1657  		endStream: true,
  1658  	})
  1659  	if err := st.fr.WriteContinuation(1, true, EncodeHeaderRaw(t, "foo", "bar")); err != nil {
  1660  		t.Fatal(err)
  1661  	}
  1662  	st.wantGoAway(1, ErrCodeProtocol)
  1663  }
  1664  
  1665  // test HEADERS w/o EndHeaders + a continuation HEADERS on wrong stream ID
  1666  func TestServer_Rejects_HeadersNoEnd_Then_ContinuationWrongStream(t *testing.T) {
  1667  	synctest.Test(t, testServer_Rejects_HeadersNoEnd_Then_ContinuationWrongStream)
  1668  }
  1669  func testServer_Rejects_HeadersNoEnd_Then_ContinuationWrongStream(t *testing.T) {
  1670  	st := newServerTesterForError(t)
  1671  	st.writeHeaders(HeadersFrameParam{
  1672  		StreamID:      1,
  1673  		BlockFragment: st.encodeHeader(),
  1674  		EndStream:     true,
  1675  		EndHeaders:    false,
  1676  	})
  1677  	if err := st.fr.WriteContinuation(3, true, EncodeHeaderRaw(t, "foo", "bar")); err != nil {
  1678  		t.Fatal(err)
  1679  	}
  1680  	st.wantGoAway(0, ErrCodeProtocol)
  1681  }
  1682  
  1683  // No HEADERS on stream 0.
  1684  func TestServer_Rejects_Headers0(t *testing.T) { synctest.Test(t, testServer_Rejects_Headers0) }
  1685  func testServer_Rejects_Headers0(t *testing.T) {
  1686  	st := newServerTesterForError(t)
  1687  	st.fr.AllowIllegalWrites = true
  1688  	st.writeHeaders(HeadersFrameParam{
  1689  		StreamID:      0,
  1690  		BlockFragment: st.encodeHeader(),
  1691  		EndStream:     true,
  1692  		EndHeaders:    true,
  1693  	})
  1694  	st.wantGoAway(0, ErrCodeProtocol)
  1695  }
  1696  
  1697  // No CONTINUATION on stream 0.
  1698  func TestServer_Rejects_Continuation0(t *testing.T) {
  1699  	synctest.Test(t, testServer_Rejects_Continuation0)
  1700  }
  1701  func testServer_Rejects_Continuation0(t *testing.T) {
  1702  	st := newServerTesterForError(t)
  1703  	st.fr.AllowIllegalWrites = true
  1704  	if err := st.fr.WriteContinuation(0, true, st.encodeHeader()); err != nil {
  1705  		t.Fatal(err)
  1706  	}
  1707  	st.wantGoAway(0, ErrCodeProtocol)
  1708  }
  1709  
  1710  // No PRIORITY on stream 0.
  1711  func TestServer_Rejects_Priority0(t *testing.T) { synctest.Test(t, testServer_Rejects_Priority0) }
  1712  func testServer_Rejects_Priority0(t *testing.T) {
  1713  	st := newServerTesterForError(t)
  1714  	st.fr.AllowIllegalWrites = true
  1715  	st.writePriority(0, PriorityParam{StreamDep: 1})
  1716  	st.wantGoAway(0, ErrCodeProtocol)
  1717  }
  1718  
  1719  // PRIORITY_UPDATE only accepts non-zero ID for the prioritized stream ID in
  1720  // its payload.
  1721  func TestServer_Rejects_PriorityUpdate0(t *testing.T) {
  1722  	synctest.Test(t, testServer_Rejects_PriorityUpdate0)
  1723  }
  1724  func testServer_Rejects_PriorityUpdate0(t *testing.T) {
  1725  	st := newServerTesterForError(t)
  1726  	st.fr.AllowIllegalWrites = true
  1727  	st.writePriorityUpdate(0, "")
  1728  	st.wantGoAway(0, ErrCodeProtocol)
  1729  }
  1730  
  1731  // PRIORITY_UPDATE with unparsable priority parameters may be rejected.
  1732  func TestServer_Rejects_PriorityUpdateUnparsable(t *testing.T) {
  1733  	synctest.Test(t, testServer_Rejects_PriorityUnparsable)
  1734  }
  1735  func testServer_Rejects_PriorityUnparsable(t *testing.T) {
  1736  	st := newServerTester(t, nil)
  1737  	defer st.Close()
  1738  	st.greet()
  1739  	st.writePriorityUpdate(1, "Invalid dictionary: ((((")
  1740  	st.wantRSTStream(1, ErrCodeProtocol)
  1741  }
  1742  
  1743  // No HEADERS frame with a self-dependence.
  1744  func TestServer_Rejects_HeadersSelfDependence(t *testing.T) {
  1745  	synctest.Test(t, testServer_Rejects_HeadersSelfDependence)
  1746  }
  1747  func testServer_Rejects_HeadersSelfDependence(t *testing.T) {
  1748  	testServerRejectsStream(t, ErrCodeProtocol, func(st *serverTester) {
  1749  		st.fr.AllowIllegalWrites = true
  1750  		st.writeHeaders(HeadersFrameParam{
  1751  			StreamID:      1,
  1752  			BlockFragment: st.encodeHeader(),
  1753  			EndStream:     true,
  1754  			EndHeaders:    true,
  1755  			Priority:      PriorityParam{StreamDep: 1},
  1756  		})
  1757  	})
  1758  }
  1759  
  1760  // No PRIORITY frame with a self-dependence.
  1761  func TestServer_Rejects_PrioritySelfDependence(t *testing.T) {
  1762  	synctest.Test(t, testServer_Rejects_PrioritySelfDependence)
  1763  }
  1764  func testServer_Rejects_PrioritySelfDependence(t *testing.T) {
  1765  	testServerRejectsStream(t, ErrCodeProtocol, func(st *serverTester) {
  1766  		st.fr.AllowIllegalWrites = true
  1767  		st.writePriority(1, PriorityParam{StreamDep: 1})
  1768  	})
  1769  }
  1770  
  1771  func TestServer_Rejects_PushPromise(t *testing.T) { synctest.Test(t, testServer_Rejects_PushPromise) }
  1772  func testServer_Rejects_PushPromise(t *testing.T) {
  1773  	st := newServerTesterForError(t)
  1774  	pp := PushPromiseParam{
  1775  		StreamID:  1,
  1776  		PromiseID: 3,
  1777  	}
  1778  	if err := st.fr.WritePushPromise(pp); err != nil {
  1779  		t.Fatal(err)
  1780  	}
  1781  	st.wantGoAway(1, ErrCodeProtocol)
  1782  }
  1783  
  1784  // testServerRejectsStream tests that the server sends a RST_STREAM with the provided
  1785  // error code after a client sends a bogus request.
  1786  func testServerRejectsStream(t *testing.T, code ErrCode, writeReq func(*serverTester)) {
  1787  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {})
  1788  	defer st.Close()
  1789  	st.greet()
  1790  	writeReq(st)
  1791  	st.wantRSTStream(1, code)
  1792  }
  1793  
  1794  // testServerRequest sets up an idle HTTP/2 connection and lets you
  1795  // write a single request with writeReq, and then verify that the
  1796  // *http.Request is built correctly in checkReq.
  1797  func testServerRequest(t *testing.T, writeReq func(*serverTester), checkReq func(*http.Request)) {
  1798  	gotReq := make(chan bool, 1)
  1799  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1800  		if r.Body == nil {
  1801  			t.Fatal("nil Body")
  1802  		}
  1803  		checkReq(r)
  1804  		gotReq <- true
  1805  	})
  1806  	defer st.Close()
  1807  
  1808  	st.greet()
  1809  	writeReq(st)
  1810  	<-gotReq
  1811  }
  1812  
  1813  func getSlash(st *serverTester) { st.bodylessReq1() }
  1814  
  1815  func TestServer_Response_NoData(t *testing.T) { synctest.Test(t, testServer_Response_NoData) }
  1816  func testServer_Response_NoData(t *testing.T) {
  1817  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  1818  		// Nothing.
  1819  		return nil
  1820  	}, func(st *serverTester) {
  1821  		getSlash(st)
  1822  		st.wantHeaders(wantHeader{
  1823  			streamID:  1,
  1824  			endStream: true,
  1825  		})
  1826  	})
  1827  }
  1828  
  1829  func TestServer_Response_NoData_Header_FooBar(t *testing.T) {
  1830  	synctest.Test(t, testServer_Response_NoData_Header_FooBar)
  1831  }
  1832  func testServer_Response_NoData_Header_FooBar(t *testing.T) {
  1833  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  1834  		w.Header().Set("Foo-Bar", "some-value")
  1835  		return nil
  1836  	}, func(st *serverTester) {
  1837  		getSlash(st)
  1838  		st.wantHeaders(wantHeader{
  1839  			streamID:  1,
  1840  			endStream: true,
  1841  			header: http.Header{
  1842  				":status":        []string{"200"},
  1843  				"foo-bar":        []string{"some-value"},
  1844  				"content-length": []string{"0"},
  1845  			},
  1846  		})
  1847  	})
  1848  }
  1849  
  1850  // Reject content-length headers containing a sign.
  1851  // See https://golang.org/issue/39017
  1852  func TestServerIgnoresContentLengthSignWhenWritingChunks(t *testing.T) {
  1853  	synctest.Test(t, testServerIgnoresContentLengthSignWhenWritingChunks)
  1854  }
  1855  func testServerIgnoresContentLengthSignWhenWritingChunks(t *testing.T) {
  1856  	tests := []struct {
  1857  		name   string
  1858  		cl     string
  1859  		wantCL string
  1860  	}{
  1861  		{
  1862  			name:   "proper content-length",
  1863  			cl:     "3",
  1864  			wantCL: "3",
  1865  		},
  1866  		{
  1867  			name:   "ignore cl with plus sign",
  1868  			cl:     "+3",
  1869  			wantCL: "0",
  1870  		},
  1871  		{
  1872  			name:   "ignore cl with minus sign",
  1873  			cl:     "-3",
  1874  			wantCL: "0",
  1875  		},
  1876  		{
  1877  			name:   "max int64, for safe uint64->int64 conversion",
  1878  			cl:     "9223372036854775807",
  1879  			wantCL: "9223372036854775807",
  1880  		},
  1881  		{
  1882  			name:   "overflows int64, so ignored",
  1883  			cl:     "9223372036854775808",
  1884  			wantCL: "0",
  1885  		},
  1886  	}
  1887  
  1888  	for _, tt := range tests {
  1889  		testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  1890  			w.Header().Set("content-length", tt.cl)
  1891  			return nil
  1892  		}, func(st *serverTester) {
  1893  			getSlash(st)
  1894  			st.wantHeaders(wantHeader{
  1895  				streamID:  1,
  1896  				endStream: true,
  1897  				header: http.Header{
  1898  					":status":        []string{"200"},
  1899  					"content-length": []string{tt.wantCL},
  1900  				},
  1901  			})
  1902  		})
  1903  	}
  1904  }
  1905  
  1906  // Reject content-length headers containing a sign.
  1907  // See https://golang.org/issue/39017
  1908  func TestServerRejectsContentLengthWithSignNewRequests(t *testing.T) {
  1909  	tests := []struct {
  1910  		name   string
  1911  		cl     string
  1912  		wantCL int64
  1913  	}{
  1914  		{
  1915  			name:   "proper content-length",
  1916  			cl:     "3",
  1917  			wantCL: 3,
  1918  		},
  1919  		{
  1920  			name:   "ignore cl with plus sign",
  1921  			cl:     "+3",
  1922  			wantCL: 0,
  1923  		},
  1924  		{
  1925  			name:   "ignore cl with minus sign",
  1926  			cl:     "-3",
  1927  			wantCL: 0,
  1928  		},
  1929  		{
  1930  			name:   "max int64, for safe uint64->int64 conversion",
  1931  			cl:     "9223372036854775807",
  1932  			wantCL: 9223372036854775807,
  1933  		},
  1934  		{
  1935  			name:   "overflows int64, so ignored",
  1936  			cl:     "9223372036854775808",
  1937  			wantCL: 0,
  1938  		},
  1939  	}
  1940  
  1941  	for _, tt := range tests {
  1942  		synctestSubtest(t, tt.name, func(t *testing.T) {
  1943  			writeReq := func(st *serverTester) {
  1944  				st.writeHeaders(HeadersFrameParam{
  1945  					StreamID:      1, // clients send odd numbers
  1946  					BlockFragment: st.encodeHeader("content-length", tt.cl),
  1947  					EndStream:     false,
  1948  					EndHeaders:    true,
  1949  				})
  1950  				st.writeData(1, false, []byte(""))
  1951  			}
  1952  			checkReq := func(r *http.Request) {
  1953  				if r.ContentLength != tt.wantCL {
  1954  					t.Fatalf("Got: %d\nWant: %d", r.ContentLength, tt.wantCL)
  1955  				}
  1956  			}
  1957  			testServerRequest(t, writeReq, checkReq)
  1958  		})
  1959  	}
  1960  }
  1961  
  1962  func TestServerContentLengthDuplicates(t *testing.T) {
  1963  	tests := []struct {
  1964  		name     string
  1965  		clValues []string
  1966  		wantOk   bool
  1967  	}{
  1968  		{
  1969  			name:     "single value",
  1970  			clValues: []string{"123"},
  1971  			wantOk:   true,
  1972  		},
  1973  		{
  1974  			name:     "identical duplicate values",
  1975  			clValues: []string{"123", "123", "123"},
  1976  			wantOk:   true,
  1977  		},
  1978  		{
  1979  			name:     "identical duplicate values with extra whitespace",
  1980  			clValues: []string{"123", " 123", "123"},
  1981  			wantOk:   false,
  1982  		},
  1983  		{
  1984  			name:     "different duplicate values",
  1985  			clValues: []string{"123", "321", "123"},
  1986  			wantOk:   false,
  1987  		},
  1988  	}
  1989  	for _, tt := range tests {
  1990  		synctestSubtest(t, tt.name, func(t *testing.T) {
  1991  			st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  1992  				w.WriteHeader(200)
  1993  			})
  1994  			defer st.Close()
  1995  			st.greet()
  1996  
  1997  			headers := []string{":method", "GET"}
  1998  			for _, val := range tt.clValues {
  1999  				headers = append(headers, "content-length", val)
  2000  			}
  2001  			st.writeHeaders(HeadersFrameParam{
  2002  				StreamID:      1,
  2003  				BlockFragment: st.encodeHeader(headers...),
  2004  				EndStream:     false,
  2005  				EndHeaders:    true,
  2006  			})
  2007  			if tt.wantOk {
  2008  				st.wantHeaders(wantHeader{
  2009  					streamID:  1,
  2010  					endStream: true,
  2011  					header:    http.Header{":status": []string{"200"}},
  2012  				})
  2013  			} else {
  2014  				st.wantRSTStream(1, ErrCodeProtocol)
  2015  			}
  2016  		})
  2017  	}
  2018  }
  2019  
  2020  func TestServer_Response_Data_Sniff_DoesntOverride(t *testing.T) {
  2021  	synctest.Test(t, testServer_Response_Data_Sniff_DoesntOverride)
  2022  }
  2023  func testServer_Response_Data_Sniff_DoesntOverride(t *testing.T) {
  2024  	const msg = "<html>this is HTML."
  2025  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2026  		w.Header().Set("Content-Type", "foo/bar")
  2027  		io.WriteString(w, msg)
  2028  		return nil
  2029  	}, func(st *serverTester) {
  2030  		getSlash(st)
  2031  		st.wantHeaders(wantHeader{
  2032  			streamID:  1,
  2033  			endStream: false,
  2034  			header: http.Header{
  2035  				":status":        []string{"200"},
  2036  				"content-type":   []string{"foo/bar"},
  2037  				"content-length": []string{strconv.Itoa(len(msg))},
  2038  			},
  2039  		})
  2040  		st.wantData(wantData{
  2041  			streamID:  1,
  2042  			endStream: true,
  2043  			data:      []byte(msg),
  2044  		})
  2045  	})
  2046  }
  2047  
  2048  func TestServer_Response_TransferEncoding_chunked(t *testing.T) {
  2049  	synctest.Test(t, testServer_Response_TransferEncoding_chunked)
  2050  }
  2051  func testServer_Response_TransferEncoding_chunked(t *testing.T) {
  2052  	const msg = "hi"
  2053  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2054  		w.Header().Set("Transfer-Encoding", "chunked") // should be stripped
  2055  		io.WriteString(w, msg)
  2056  		return nil
  2057  	}, func(st *serverTester) {
  2058  		getSlash(st)
  2059  		st.wantHeaders(wantHeader{
  2060  			streamID:  1,
  2061  			endStream: false,
  2062  			header: http.Header{
  2063  				":status":        []string{"200"},
  2064  				"content-type":   []string{"text/plain; charset=utf-8"},
  2065  				"content-length": []string{strconv.Itoa(len(msg))},
  2066  			},
  2067  		})
  2068  	})
  2069  }
  2070  
  2071  // Header accessed only after the initial write.
  2072  func TestServer_Response_Data_IgnoreHeaderAfterWrite_After(t *testing.T) {
  2073  	synctest.Test(t, testServer_Response_Data_IgnoreHeaderAfterWrite_After)
  2074  }
  2075  func testServer_Response_Data_IgnoreHeaderAfterWrite_After(t *testing.T) {
  2076  	const msg = "<html>this is HTML."
  2077  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2078  		io.WriteString(w, msg)
  2079  		w.Header().Set("foo", "should be ignored")
  2080  		return nil
  2081  	}, func(st *serverTester) {
  2082  		getSlash(st)
  2083  		st.wantHeaders(wantHeader{
  2084  			streamID:  1,
  2085  			endStream: false,
  2086  			header: http.Header{
  2087  				":status":        []string{"200"},
  2088  				"content-type":   []string{"text/html; charset=utf-8"},
  2089  				"content-length": []string{strconv.Itoa(len(msg))},
  2090  			},
  2091  		})
  2092  	})
  2093  }
  2094  
  2095  // Header accessed before the initial write and later mutated.
  2096  func TestServer_Response_Data_IgnoreHeaderAfterWrite_Overwrite(t *testing.T) {
  2097  	synctest.Test(t, testServer_Response_Data_IgnoreHeaderAfterWrite_Overwrite)
  2098  }
  2099  func testServer_Response_Data_IgnoreHeaderAfterWrite_Overwrite(t *testing.T) {
  2100  	const msg = "<html>this is HTML."
  2101  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2102  		w.Header().Set("foo", "proper value")
  2103  		io.WriteString(w, msg)
  2104  		w.Header().Set("foo", "should be ignored")
  2105  		return nil
  2106  	}, func(st *serverTester) {
  2107  		getSlash(st)
  2108  		st.wantHeaders(wantHeader{
  2109  			streamID:  1,
  2110  			endStream: false,
  2111  			header: http.Header{
  2112  				":status":        []string{"200"},
  2113  				"foo":            []string{"proper value"},
  2114  				"content-type":   []string{"text/html; charset=utf-8"},
  2115  				"content-length": []string{strconv.Itoa(len(msg))},
  2116  			},
  2117  		})
  2118  	})
  2119  }
  2120  
  2121  func TestServer_Response_Data_SniffLenType(t *testing.T) {
  2122  	synctest.Test(t, testServer_Response_Data_SniffLenType)
  2123  }
  2124  func testServer_Response_Data_SniffLenType(t *testing.T) {
  2125  	const msg = "<html>this is HTML."
  2126  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2127  		io.WriteString(w, msg)
  2128  		return nil
  2129  	}, func(st *serverTester) {
  2130  		getSlash(st)
  2131  		st.wantHeaders(wantHeader{
  2132  			streamID:  1,
  2133  			endStream: false,
  2134  			header: http.Header{
  2135  				":status":        []string{"200"},
  2136  				"content-type":   []string{"text/html; charset=utf-8"},
  2137  				"content-length": []string{strconv.Itoa(len(msg))},
  2138  			},
  2139  		})
  2140  		st.wantData(wantData{
  2141  			streamID:  1,
  2142  			endStream: true,
  2143  			data:      []byte(msg),
  2144  		})
  2145  	})
  2146  }
  2147  
  2148  func TestServer_Response_Header_Flush_MidWrite(t *testing.T) {
  2149  	synctest.Test(t, testServer_Response_Header_Flush_MidWrite)
  2150  }
  2151  func testServer_Response_Header_Flush_MidWrite(t *testing.T) {
  2152  	const msg = "<html>this is HTML"
  2153  	const msg2 = ", and this is the next chunk"
  2154  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2155  		io.WriteString(w, msg)
  2156  		w.(http.Flusher).Flush()
  2157  		io.WriteString(w, msg2)
  2158  		return nil
  2159  	}, func(st *serverTester) {
  2160  		getSlash(st)
  2161  		st.wantHeaders(wantHeader{
  2162  			streamID:  1,
  2163  			endStream: false,
  2164  			header: http.Header{
  2165  				":status":      []string{"200"},
  2166  				"content-type": []string{"text/html; charset=utf-8"}, // sniffed
  2167  				// and no content-length
  2168  			},
  2169  		})
  2170  		st.wantData(wantData{
  2171  			streamID:  1,
  2172  			endStream: false,
  2173  			data:      []byte(msg),
  2174  		})
  2175  		st.wantData(wantData{
  2176  			streamID:  1,
  2177  			endStream: true,
  2178  			data:      []byte(msg2),
  2179  		})
  2180  	})
  2181  }
  2182  
  2183  func TestServer_Response_LargeWrite(t *testing.T) { synctest.Test(t, testServer_Response_LargeWrite) }
  2184  func testServer_Response_LargeWrite(t *testing.T) {
  2185  	const size = 1 << 20
  2186  	const maxFrameSize = 16 << 10
  2187  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2188  		n, err := w.Write(bytes.Repeat([]byte("a"), size))
  2189  		if err != nil {
  2190  			return fmt.Errorf("Write error: %v", err)
  2191  		}
  2192  		if n != size {
  2193  			return fmt.Errorf("wrong size %d from Write", n)
  2194  		}
  2195  		return nil
  2196  	}, func(st *serverTester) {
  2197  		if err := st.fr.WriteSettings(
  2198  			Setting{SettingInitialWindowSize, 0},
  2199  			Setting{SettingMaxFrameSize, maxFrameSize},
  2200  		); err != nil {
  2201  			t.Fatal(err)
  2202  		}
  2203  		st.wantSettingsAck()
  2204  
  2205  		getSlash(st) // make the single request
  2206  
  2207  		// Give the handler quota to write:
  2208  		if err := st.fr.WriteWindowUpdate(1, size); err != nil {
  2209  			t.Fatal(err)
  2210  		}
  2211  		// Give the handler quota to write to connection-level
  2212  		// window as well
  2213  		if err := st.fr.WriteWindowUpdate(0, size); err != nil {
  2214  			t.Fatal(err)
  2215  		}
  2216  		st.wantHeaders(wantHeader{
  2217  			streamID:  1,
  2218  			endStream: false,
  2219  			header: http.Header{
  2220  				":status":      []string{"200"},
  2221  				"content-type": []string{"text/plain; charset=utf-8"}, // sniffed
  2222  				// and no content-length
  2223  			},
  2224  		})
  2225  		var bytes, frames int
  2226  		for {
  2227  			df := readFrame[*DataFrame](t, st)
  2228  			bytes += len(df.Data())
  2229  			frames++
  2230  			for _, b := range df.Data() {
  2231  				if b != 'a' {
  2232  					t.Fatal("non-'a' byte seen in DATA")
  2233  				}
  2234  			}
  2235  			if df.StreamEnded() {
  2236  				break
  2237  			}
  2238  		}
  2239  		if bytes != size {
  2240  			t.Errorf("Got %d bytes; want %d", bytes, size)
  2241  		}
  2242  		if want := int(size / maxFrameSize); frames < want || frames > want*2 {
  2243  			t.Errorf("Got %d frames; want %d", frames, size)
  2244  		}
  2245  	})
  2246  }
  2247  
  2248  // Test that the handler can't write more than the client allows
  2249  func TestServer_Response_LargeWrite_FlowControlled(t *testing.T) {
  2250  	synctest.Test(t, testServer_Response_LargeWrite_FlowControlled)
  2251  }
  2252  func testServer_Response_LargeWrite_FlowControlled(t *testing.T) {
  2253  	// Make these reads. Before each read, the client adds exactly enough
  2254  	// flow-control to satisfy the read. Numbers chosen arbitrarily.
  2255  	reads := []int{123, 1, 13, 127}
  2256  	size := 0
  2257  	for _, n := range reads {
  2258  		size += n
  2259  	}
  2260  
  2261  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2262  		w.(http.Flusher).Flush()
  2263  		n, err := w.Write(bytes.Repeat([]byte("a"), size))
  2264  		if err != nil {
  2265  			return fmt.Errorf("Write error: %v", err)
  2266  		}
  2267  		if n != size {
  2268  			return fmt.Errorf("wrong size %d from Write", n)
  2269  		}
  2270  		return nil
  2271  	}, func(st *serverTester) {
  2272  		// Set the window size to something explicit for this test.
  2273  		// It's also how much initial data we expect.
  2274  		if err := st.fr.WriteSettings(Setting{SettingInitialWindowSize, uint32(reads[0])}); err != nil {
  2275  			t.Fatal(err)
  2276  		}
  2277  		st.wantSettingsAck()
  2278  
  2279  		getSlash(st) // make the single request
  2280  
  2281  		st.wantHeaders(wantHeader{
  2282  			streamID:  1,
  2283  			endStream: false,
  2284  		})
  2285  
  2286  		st.wantData(wantData{
  2287  			streamID:  1,
  2288  			endStream: false,
  2289  			size:      reads[0],
  2290  		})
  2291  
  2292  		for i, quota := range reads[1:] {
  2293  			if err := st.fr.WriteWindowUpdate(1, uint32(quota)); err != nil {
  2294  				t.Fatal(err)
  2295  			}
  2296  			st.wantData(wantData{
  2297  				streamID:  1,
  2298  				endStream: i == len(reads[1:])-1,
  2299  				size:      quota,
  2300  			})
  2301  		}
  2302  	})
  2303  }
  2304  
  2305  // Test that the handler blocked in a Write is unblocked if the server sends a RST_STREAM.
  2306  func TestServer_Response_RST_Unblocks_LargeWrite(t *testing.T) {
  2307  	synctest.Test(t, testServer_Response_RST_Unblocks_LargeWrite)
  2308  }
  2309  func testServer_Response_RST_Unblocks_LargeWrite(t *testing.T) {
  2310  	const size = 1 << 20
  2311  	const maxFrameSize = 16 << 10
  2312  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2313  		w.(http.Flusher).Flush()
  2314  		_, err := w.Write(bytes.Repeat([]byte("a"), size))
  2315  		if err == nil {
  2316  			return errors.New("unexpected nil error from Write in handler")
  2317  		}
  2318  		return nil
  2319  	}, func(st *serverTester) {
  2320  		if err := st.fr.WriteSettings(
  2321  			Setting{SettingInitialWindowSize, 0},
  2322  			Setting{SettingMaxFrameSize, maxFrameSize},
  2323  		); err != nil {
  2324  			t.Fatal(err)
  2325  		}
  2326  		st.wantSettingsAck()
  2327  
  2328  		getSlash(st) // make the single request
  2329  
  2330  		st.wantHeaders(wantHeader{
  2331  			streamID:  1,
  2332  			endStream: false,
  2333  		})
  2334  
  2335  		if err := st.fr.WriteRSTStream(1, ErrCodeCancel); err != nil {
  2336  			t.Fatal(err)
  2337  		}
  2338  	})
  2339  }
  2340  
  2341  func TestServer_Response_Empty_Data_Not_FlowControlled(t *testing.T) {
  2342  	synctest.Test(t, testServer_Response_Empty_Data_Not_FlowControlled)
  2343  }
  2344  func testServer_Response_Empty_Data_Not_FlowControlled(t *testing.T) {
  2345  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2346  		w.(http.Flusher).Flush()
  2347  		// Nothing; send empty DATA
  2348  		return nil
  2349  	}, func(st *serverTester) {
  2350  		// Handler gets no data quota:
  2351  		if err := st.fr.WriteSettings(Setting{SettingInitialWindowSize, 0}); err != nil {
  2352  			t.Fatal(err)
  2353  		}
  2354  		st.wantSettingsAck()
  2355  
  2356  		getSlash(st) // make the single request
  2357  
  2358  		st.wantHeaders(wantHeader{
  2359  			streamID:  1,
  2360  			endStream: false,
  2361  		})
  2362  
  2363  		st.wantData(wantData{
  2364  			streamID:  1,
  2365  			endStream: true,
  2366  			size:      0,
  2367  		})
  2368  	})
  2369  }
  2370  
  2371  func TestServer_Response_Automatic100Continue(t *testing.T) {
  2372  	synctest.Test(t, testServer_Response_Automatic100Continue)
  2373  }
  2374  func testServer_Response_Automatic100Continue(t *testing.T) {
  2375  	const msg = "foo"
  2376  	const reply = "bar"
  2377  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2378  		if v := r.Header.Get("Expect"); v != "" {
  2379  			t.Errorf("Expect header = %q; want empty", v)
  2380  		}
  2381  		buf := make([]byte, len(msg))
  2382  		// This read should trigger the 100-continue being sent.
  2383  		if n, err := io.ReadFull(r.Body, buf); err != nil || n != len(msg) || string(buf) != msg {
  2384  			return fmt.Errorf("ReadFull = %q, %v; want %q, nil", buf[:n], err, msg)
  2385  		}
  2386  		_, err := io.WriteString(w, reply)
  2387  		return err
  2388  	}, func(st *serverTester) {
  2389  		st.writeHeaders(HeadersFrameParam{
  2390  			StreamID:      1, // clients send odd numbers
  2391  			BlockFragment: st.encodeHeader(":method", "POST", "expect", "100-Continue"),
  2392  			EndStream:     false,
  2393  			EndHeaders:    true,
  2394  		})
  2395  		st.wantHeaders(wantHeader{
  2396  			streamID:  1,
  2397  			endStream: false,
  2398  			header: http.Header{
  2399  				":status": []string{"100"},
  2400  			},
  2401  		})
  2402  
  2403  		// Okay, they sent status 100, so we can send our
  2404  		// gigantic and/or sensitive "foo" payload now.
  2405  		st.writeData(1, true, []byte(msg))
  2406  
  2407  		st.wantHeaders(wantHeader{
  2408  			streamID:  1,
  2409  			endStream: false,
  2410  			header: http.Header{
  2411  				":status":        []string{"200"},
  2412  				"content-type":   []string{"text/plain; charset=utf-8"},
  2413  				"content-length": []string{strconv.Itoa(len(reply))},
  2414  			},
  2415  		})
  2416  
  2417  		st.wantData(wantData{
  2418  			streamID:  1,
  2419  			endStream: true,
  2420  			data:      []byte(reply),
  2421  		})
  2422  	})
  2423  }
  2424  
  2425  func TestServer_HandlerWriteErrorOnDisconnect(t *testing.T) {
  2426  	synctest.Test(t, testServer_HandlerWriteErrorOnDisconnect)
  2427  }
  2428  func testServer_HandlerWriteErrorOnDisconnect(t *testing.T) {
  2429  	errc := make(chan error, 1)
  2430  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2431  		p := []byte("some data.\n")
  2432  		for {
  2433  			_, err := w.Write(p)
  2434  			if err != nil {
  2435  				errc <- err
  2436  				return nil
  2437  			}
  2438  		}
  2439  	}, func(st *serverTester) {
  2440  		st.writeHeaders(HeadersFrameParam{
  2441  			StreamID:      1,
  2442  			BlockFragment: st.encodeHeader(),
  2443  			EndStream:     false,
  2444  			EndHeaders:    true,
  2445  		})
  2446  		st.wantHeaders(wantHeader{
  2447  			streamID:  1,
  2448  			endStream: false,
  2449  		})
  2450  		// Close the connection and wait for the handler to (hopefully) notice.
  2451  		st.cc.Close()
  2452  		_ = <-errc
  2453  	})
  2454  }
  2455  
  2456  func TestServer_Rejects_Too_Many_Streams(t *testing.T) {
  2457  	synctest.Test(t, testServer_Rejects_Too_Many_Streams)
  2458  }
  2459  func testServer_Rejects_Too_Many_Streams(t *testing.T) {
  2460  	st := newServerTester(t, nil)
  2461  	st.greet()
  2462  	nextStreamID := uint32(1)
  2463  	streamID := func() uint32 {
  2464  		defer func() { nextStreamID += 2 }()
  2465  		return nextStreamID
  2466  	}
  2467  	sendReq := func(id uint32) {
  2468  		st.writeHeaders(HeadersFrameParam{
  2469  			StreamID: id,
  2470  			BlockFragment: st.encodeHeader(
  2471  				":path", fmt.Sprintf("/%v", id),
  2472  			),
  2473  			EndStream:  true,
  2474  			EndHeaders: true,
  2475  		})
  2476  	}
  2477  	var calls []*serverHandlerCall
  2478  	for range DefaultMaxStreams {
  2479  		sendReq(streamID())
  2480  		calls = append(calls, st.nextHandlerCall())
  2481  	}
  2482  
  2483  	// And this one should cross the limit:
  2484  	// (It's also sent as a CONTINUATION, to verify we still track the decoder context,
  2485  	// even if we're rejecting it)
  2486  	rejectID := streamID()
  2487  	headerBlock := st.encodeHeader(":path", fmt.Sprintf("/%v", rejectID))
  2488  	frag1, frag2 := headerBlock[:3], headerBlock[3:]
  2489  	st.writeHeaders(HeadersFrameParam{
  2490  		StreamID:      rejectID,
  2491  		BlockFragment: frag1,
  2492  		EndStream:     true,
  2493  		EndHeaders:    false, // CONTINUATION coming
  2494  	})
  2495  	if err := st.fr.WriteContinuation(rejectID, true, frag2); err != nil {
  2496  		t.Fatal(err)
  2497  	}
  2498  	st.sync()
  2499  	st.wantRSTStream(rejectID, ErrCodeProtocol)
  2500  
  2501  	// But let a handler finish:
  2502  	calls[0].exit()
  2503  	st.sync()
  2504  	st.wantHeaders(wantHeader{
  2505  		streamID:  1,
  2506  		endStream: true,
  2507  	})
  2508  
  2509  	// And now another stream should be able to start:
  2510  	goodID := streamID()
  2511  	sendReq(goodID)
  2512  	call := st.nextHandlerCall()
  2513  	if got, want := call.req.URL.Path, fmt.Sprintf("/%d", goodID); got != want {
  2514  		t.Errorf("Got request for %q, want %q", got, want)
  2515  	}
  2516  }
  2517  
  2518  // So many response headers that the server needs to use CONTINUATION frames:
  2519  func TestServer_Response_ManyHeaders_With_Continuation(t *testing.T) {
  2520  	synctest.Test(t, testServer_Response_ManyHeaders_With_Continuation)
  2521  }
  2522  func testServer_Response_ManyHeaders_With_Continuation(t *testing.T) {
  2523  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2524  		h := w.Header()
  2525  		for i := range 5000 {
  2526  			h.Set(fmt.Sprintf("x-header-%d", i), fmt.Sprintf("x-value-%d", i))
  2527  		}
  2528  		return nil
  2529  	}, func(st *serverTester) {
  2530  		getSlash(st)
  2531  		hf := readFrame[*HeadersFrame](t, st)
  2532  		if hf.HeadersEnded() {
  2533  			t.Fatal("got unwanted END_HEADERS flag")
  2534  		}
  2535  		n := 0
  2536  		for {
  2537  			n++
  2538  			cf := readFrame[*ContinuationFrame](t, st)
  2539  			if cf.HeadersEnded() {
  2540  				break
  2541  			}
  2542  		}
  2543  		if n < 5 {
  2544  			t.Errorf("Only got %d CONTINUATION frames; expected 5+ (currently 6)", n)
  2545  		}
  2546  	})
  2547  }
  2548  
  2549  // This previously crashed (reported by Mathieu Lonjaret as observed
  2550  // while using Camlistore) because we got a DATA frame from the client
  2551  // after the handler exited and our logic at the time was wrong,
  2552  // keeping a stream in the map in stateClosed, which tickled an
  2553  // invariant check later when we tried to remove that stream (via
  2554  // defer sc.closeAllStreamsOnConnClose) when the serverConn serve loop
  2555  // ended.
  2556  func TestServer_NoCrash_HandlerClose_Then_ClientClose(t *testing.T) {
  2557  	synctest.Test(t, testServer_NoCrash_HandlerClose_Then_ClientClose)
  2558  }
  2559  func testServer_NoCrash_HandlerClose_Then_ClientClose(t *testing.T) {
  2560  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2561  		// nothing
  2562  		return nil
  2563  	}, func(st *serverTester) {
  2564  		st.writeHeaders(HeadersFrameParam{
  2565  			StreamID:      1,
  2566  			BlockFragment: st.encodeHeader(),
  2567  			EndStream:     false, // DATA is coming
  2568  			EndHeaders:    true,
  2569  		})
  2570  		st.wantHeaders(wantHeader{
  2571  			streamID:  1,
  2572  			endStream: true,
  2573  		})
  2574  
  2575  		// Sent when the a Handler closes while a client has
  2576  		// indicated it's still sending DATA:
  2577  		st.wantRSTStream(1, ErrCodeNo)
  2578  
  2579  		// Now the handler has ended, so it's ended its
  2580  		// stream, but the client hasn't closed its side
  2581  		// (stateClosedLocal).  So send more data and verify
  2582  		// it doesn't crash with an internal invariant panic, like
  2583  		// it did before.
  2584  		st.writeData(1, true, []byte("foo"))
  2585  
  2586  		// Sent after a peer sends data anyway (admittedly the
  2587  		// previous RST_STREAM might've still been in-flight),
  2588  		// but they'll get the more friendly 'cancel' code
  2589  		// first.
  2590  		st.wantRSTStream(1, ErrCodeStreamClosed)
  2591  
  2592  		// We should have our flow control bytes back,
  2593  		// since the handler didn't get them.
  2594  		st.wantConnFlowControlConsumed(0)
  2595  
  2596  		// Set up a bunch of machinery to record the panic we saw
  2597  		// previously.
  2598  		var (
  2599  			panMu    sync.Mutex
  2600  			panicVal any
  2601  		)
  2602  
  2603  		SetTestHookOnPanic(t, func(sc *ServerConn, pv any) bool {
  2604  			panMu.Lock()
  2605  			panicVal = pv
  2606  			panMu.Unlock()
  2607  			return true
  2608  		})
  2609  
  2610  		// Now force the serve loop to end, via closing the connection.
  2611  		st.cc.Close()
  2612  		synctest.Wait()
  2613  
  2614  		panMu.Lock()
  2615  		got := panicVal
  2616  		panMu.Unlock()
  2617  		if got != nil {
  2618  			t.Errorf("Got panic: %v", got)
  2619  		}
  2620  	})
  2621  }
  2622  
  2623  func TestServer_Rejects_TLS10(t *testing.T) { testRejectTLS(t, tls.VersionTLS10) }
  2624  func TestServer_Rejects_TLS11(t *testing.T) { testRejectTLS(t, tls.VersionTLS11) }
  2625  
  2626  func testRejectTLS(t *testing.T, version uint16) {
  2627  	synctest.Test(t, func(t *testing.T) {
  2628  		st := newServerTester(t, nil, func(state *tls.ConnectionState) {
  2629  			// As of 1.18 the default minimum Go TLS version is
  2630  			// 1.2. In order to test rejection of lower versions,
  2631  			// manually set the version to 1.0
  2632  			state.Version = version
  2633  		})
  2634  		defer st.Close()
  2635  		st.wantGoAway(0, ErrCodeInadequateSecurity)
  2636  	})
  2637  }
  2638  
  2639  func TestServer_Rejects_TLSBadCipher(t *testing.T) { synctest.Test(t, testServer_Rejects_TLSBadCipher) }
  2640  func testServer_Rejects_TLSBadCipher(t *testing.T) {
  2641  	st := newServerTester(t, nil, func(state *tls.ConnectionState) {
  2642  		state.Version = tls.VersionTLS12
  2643  		state.CipherSuite = tls.TLS_RSA_WITH_RC4_128_SHA
  2644  	})
  2645  	defer st.Close()
  2646  	st.wantGoAway(0, ErrCodeInadequateSecurity)
  2647  }
  2648  
  2649  func TestServer_Advertises_Common_Cipher(t *testing.T) {
  2650  	synctest.Test(t, testServer_Advertises_Common_Cipher)
  2651  }
  2652  func testServer_Advertises_Common_Cipher(t *testing.T) {
  2653  	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  2654  	}, func(srv *http.Server) {
  2655  		// Have the server configured with no specific cipher suites.
  2656  		// This tests that Go's defaults include the required one.
  2657  		srv.TLSConfig = nil
  2658  	})
  2659  
  2660  	// Have the client only support the one required by the spec.
  2661  	const requiredSuite = tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  2662  	tlsConfig := tlsConfigInsecure.Clone()
  2663  	tlsConfig.MaxVersion = tls.VersionTLS12
  2664  	tlsConfig.CipherSuites = []uint16{requiredSuite}
  2665  	tr := &http.Transport{
  2666  		TLSClientConfig: tlsConfig,
  2667  		Protocols:       protocols("h2"),
  2668  	}
  2669  	defer tr.CloseIdleConnections()
  2670  
  2671  	req, err := http.NewRequest("GET", ts.URL, nil)
  2672  	if err != nil {
  2673  		t.Fatal(err)
  2674  	}
  2675  	res, err := tr.RoundTrip(req)
  2676  	if err != nil {
  2677  		t.Fatal(err)
  2678  	}
  2679  	res.Body.Close()
  2680  }
  2681  
  2682  // testServerResponse sets up an idle HTTP/2 connection. The client function should
  2683  // write a single request that must be handled by the handler.
  2684  func testServerResponse(t *testing.T,
  2685  	handler func(http.ResponseWriter, *http.Request) error,
  2686  	client func(*serverTester),
  2687  ) {
  2688  	errc := make(chan error, 1)
  2689  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  2690  		if r.Body == nil {
  2691  			t.Fatal("nil Body")
  2692  		}
  2693  		err := handler(w, r)
  2694  		select {
  2695  		case errc <- err:
  2696  		default:
  2697  			t.Errorf("unexpected duplicate request")
  2698  		}
  2699  	})
  2700  	defer st.Close()
  2701  
  2702  	st.greet()
  2703  	client(st)
  2704  
  2705  	if err := <-errc; err != nil {
  2706  		t.Fatalf("Error in handler: %v", err)
  2707  	}
  2708  }
  2709  
  2710  // readBodyHandler returns an http Handler func that reads len(want)
  2711  // bytes from r.Body and fails t if the contents read were not
  2712  // the value of want.
  2713  func readBodyHandler(t *testing.T, want string) func(w http.ResponseWriter, r *http.Request) {
  2714  	return func(w http.ResponseWriter, r *http.Request) {
  2715  		buf := make([]byte, len(want))
  2716  		_, err := io.ReadFull(r.Body, buf)
  2717  		if err != nil {
  2718  			t.Error(err)
  2719  			return
  2720  		}
  2721  		if string(buf) != want {
  2722  			t.Errorf("read %q; want %q", buf, want)
  2723  		}
  2724  	}
  2725  }
  2726  
  2727  func TestServer_MaxDecoderHeaderTableSize(t *testing.T) {
  2728  	synctest.Test(t, testServer_MaxDecoderHeaderTableSize)
  2729  }
  2730  func testServer_MaxDecoderHeaderTableSize(t *testing.T) {
  2731  	wantHeaderTableSize := uint32(InitialHeaderTableSize * 2)
  2732  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {}, func(h2 *http.HTTP2Config) {
  2733  		h2.MaxDecoderHeaderTableSize = int(wantHeaderTableSize)
  2734  	})
  2735  	defer st.Close()
  2736  
  2737  	var advHeaderTableSize *uint32
  2738  	st.greetAndCheckSettings(func(s Setting) error {
  2739  		switch s.ID {
  2740  		case SettingHeaderTableSize:
  2741  			advHeaderTableSize = &s.Val
  2742  		}
  2743  		return nil
  2744  	})
  2745  
  2746  	if advHeaderTableSize == nil {
  2747  		t.Errorf("server didn't advertise a header table size")
  2748  	} else if got, want := *advHeaderTableSize, wantHeaderTableSize; got != want {
  2749  		t.Errorf("server advertised a header table size of %d, want %d", got, want)
  2750  	}
  2751  }
  2752  
  2753  func TestServer_MaxEncoderHeaderTableSize(t *testing.T) {
  2754  	synctest.Test(t, testServer_MaxEncoderHeaderTableSize)
  2755  }
  2756  func testServer_MaxEncoderHeaderTableSize(t *testing.T) {
  2757  	wantHeaderTableSize := uint32(InitialHeaderTableSize / 2)
  2758  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {}, func(h2 *http.HTTP2Config) {
  2759  		h2.MaxEncoderHeaderTableSize = int(wantHeaderTableSize)
  2760  	})
  2761  	defer st.Close()
  2762  
  2763  	st.greet()
  2764  
  2765  	if got, want := st.sc.TestHPACKEncoder().MaxDynamicTableSize(), wantHeaderTableSize; got != want {
  2766  		t.Errorf("server encoder is using a header table size of %d, want %d", got, want)
  2767  	}
  2768  }
  2769  
  2770  // Issue 12843
  2771  func TestServerDoS_MaxHeaderListSize(t *testing.T) { synctest.Test(t, testServerDoS_MaxHeaderListSize) }
  2772  func testServerDoS_MaxHeaderListSize(t *testing.T) {
  2773  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {})
  2774  	defer st.Close()
  2775  
  2776  	// shake hands
  2777  	frameSize := DefaultMaxReadFrameSize
  2778  	var advHeaderListSize *uint32
  2779  	st.greetAndCheckSettings(func(s Setting) error {
  2780  		switch s.ID {
  2781  		case SettingMaxFrameSize:
  2782  			if s.Val < MinMaxFrameSize {
  2783  				frameSize = MinMaxFrameSize
  2784  			} else if s.Val > MaxFrameSize {
  2785  				frameSize = MaxFrameSize
  2786  			} else {
  2787  				frameSize = int(s.Val)
  2788  			}
  2789  		case SettingMaxHeaderListSize:
  2790  			advHeaderListSize = &s.Val
  2791  		}
  2792  		return nil
  2793  	})
  2794  
  2795  	if advHeaderListSize == nil {
  2796  		t.Errorf("server didn't advertise a max header list size")
  2797  	} else if *advHeaderListSize == 0 {
  2798  		t.Errorf("server advertised a max header list size of 0")
  2799  	}
  2800  
  2801  	st.encodeHeaderField(":method", "GET")
  2802  	st.encodeHeaderField(":path", "/")
  2803  	st.encodeHeaderField(":scheme", "https")
  2804  	cookie := strings.Repeat("*", 4058)
  2805  	st.encodeHeaderField("cookie", cookie)
  2806  	st.writeHeaders(HeadersFrameParam{
  2807  		StreamID:      1,
  2808  		BlockFragment: st.headerBuf.Bytes(),
  2809  		EndStream:     true,
  2810  		EndHeaders:    false,
  2811  	})
  2812  
  2813  	// Capture the short encoding of a duplicate ~4K cookie, now
  2814  	// that we've already sent it once.
  2815  	st.headerBuf.Reset()
  2816  	st.encodeHeaderField("cookie", cookie)
  2817  
  2818  	// Now send 1MB of it.
  2819  	const size = 1 << 20
  2820  	b := bytes.Repeat(st.headerBuf.Bytes(), size/st.headerBuf.Len())
  2821  	for len(b) > 0 {
  2822  		chunk := b
  2823  		if len(chunk) > frameSize {
  2824  			chunk = chunk[:frameSize]
  2825  		}
  2826  		b = b[len(chunk):]
  2827  		st.fr.WriteContinuation(1, len(b) == 0, chunk)
  2828  	}
  2829  
  2830  	st.wantHeaders(wantHeader{
  2831  		streamID:  1,
  2832  		endStream: false,
  2833  		header: http.Header{
  2834  			":status":        []string{"431"},
  2835  			"content-type":   []string{"text/html; charset=utf-8"},
  2836  			"content-length": []string{"63"},
  2837  		},
  2838  	})
  2839  }
  2840  
  2841  func TestServer_Response_Stream_With_Missing_Trailer(t *testing.T) {
  2842  	synctest.Test(t, testServer_Response_Stream_With_Missing_Trailer)
  2843  }
  2844  func testServer_Response_Stream_With_Missing_Trailer(t *testing.T) {
  2845  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  2846  		w.Header().Set("Trailer", "test-trailer")
  2847  		return nil
  2848  	}, func(st *serverTester) {
  2849  		getSlash(st)
  2850  		st.wantHeaders(wantHeader{
  2851  			streamID:  1,
  2852  			endStream: false,
  2853  		})
  2854  		st.wantData(wantData{
  2855  			streamID:  1,
  2856  			endStream: true,
  2857  			size:      0,
  2858  		})
  2859  	})
  2860  }
  2861  
  2862  func TestCompressionErrorOnWrite(t *testing.T) { synctest.Test(t, testCompressionErrorOnWrite) }
  2863  func testCompressionErrorOnWrite(t *testing.T) {
  2864  	const maxStrLen = 8 << 10
  2865  	var serverConfig *http.Server
  2866  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  2867  		// No response body.
  2868  	}, func(s *http.Server) {
  2869  		serverConfig = s
  2870  		serverConfig.MaxHeaderBytes = maxStrLen
  2871  	})
  2872  	st.addLogFilter("connection error: COMPRESSION_ERROR")
  2873  	defer st.Close()
  2874  	st.greet()
  2875  
  2876  	maxAllowed := st.sc.TestFramerMaxHeaderStringLen()
  2877  
  2878  	// Crank this up, now that we have a conn connected with the
  2879  	// hpack.Decoder's max string length set has been initialized
  2880  	// from the earlier low ~8K value. We want this higher so don't
  2881  	// hit the max header list size. We only want to test hitting
  2882  	// the max string size.
  2883  	serverConfig.MaxHeaderBytes = 1 << 20
  2884  
  2885  	// First a request with a header that's exactly the max allowed size
  2886  	// for the hpack compression. It's still too long for the header list
  2887  	// size, so we'll get the 431 error, but that keeps the compression
  2888  	// context still valid.
  2889  	hbf := st.encodeHeader("foo", strings.Repeat("a", maxAllowed))
  2890  
  2891  	st.writeHeaders(HeadersFrameParam{
  2892  		StreamID:      1,
  2893  		BlockFragment: hbf,
  2894  		EndStream:     true,
  2895  		EndHeaders:    true,
  2896  	})
  2897  	st.wantHeaders(wantHeader{
  2898  		streamID:  1,
  2899  		endStream: false,
  2900  		header: http.Header{
  2901  			":status":        []string{"431"},
  2902  			"content-type":   []string{"text/html; charset=utf-8"},
  2903  			"content-length": []string{"63"},
  2904  		},
  2905  	})
  2906  	df := readFrame[*DataFrame](t, st)
  2907  	if !strings.Contains(string(df.Data()), "HTTP Error 431") {
  2908  		t.Errorf("Unexpected data body: %q", df.Data())
  2909  	}
  2910  	if !df.StreamEnded() {
  2911  		t.Fatalf("expect data stream end")
  2912  	}
  2913  
  2914  	// And now send one that's just one byte too big.
  2915  	hbf = st.encodeHeader("bar", strings.Repeat("b", maxAllowed+1))
  2916  	st.writeHeaders(HeadersFrameParam{
  2917  		StreamID:      3,
  2918  		BlockFragment: hbf,
  2919  		EndStream:     true,
  2920  		EndHeaders:    true,
  2921  	})
  2922  	st.wantGoAway(3, ErrCodeCompression)
  2923  }
  2924  
  2925  func TestCompressionErrorOnClose(t *testing.T) { synctest.Test(t, testCompressionErrorOnClose) }
  2926  func testCompressionErrorOnClose(t *testing.T) {
  2927  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  2928  		// No response body.
  2929  	})
  2930  	st.addLogFilter("connection error: COMPRESSION_ERROR")
  2931  	defer st.Close()
  2932  	st.greet()
  2933  
  2934  	hbf := st.encodeHeader("foo", "bar")
  2935  	hbf = hbf[:len(hbf)-1] // truncate one byte from the end, so hpack.Decoder.Close fails.
  2936  	st.writeHeaders(HeadersFrameParam{
  2937  		StreamID:      1,
  2938  		BlockFragment: hbf,
  2939  		EndStream:     true,
  2940  		EndHeaders:    true,
  2941  	})
  2942  	st.wantGoAway(1, ErrCodeCompression)
  2943  }
  2944  
  2945  // test that a server handler can read trailers from a client
  2946  func TestServerReadsTrailers(t *testing.T) { synctest.Test(t, testServerReadsTrailers) }
  2947  func testServerReadsTrailers(t *testing.T) {
  2948  	const testBody = "some test body"
  2949  	writeReq := func(st *serverTester) {
  2950  		st.writeHeaders(HeadersFrameParam{
  2951  			StreamID:      1, // clients send odd numbers
  2952  			BlockFragment: st.encodeHeader("trailer", "Foo, Bar", "trailer", "Baz"),
  2953  			EndStream:     false,
  2954  			EndHeaders:    true,
  2955  		})
  2956  		st.writeData(1, false, []byte(testBody))
  2957  		st.writeHeaders(HeadersFrameParam{
  2958  			StreamID: 1, // clients send odd numbers
  2959  			BlockFragment: st.encodeHeaderRaw(
  2960  				"foo", "foov",
  2961  				"bar", "barv",
  2962  				"baz", "bazv",
  2963  				"surprise", "wasn't declared; shouldn't show up",
  2964  			),
  2965  			EndStream:  true,
  2966  			EndHeaders: true,
  2967  		})
  2968  	}
  2969  	checkReq := func(r *http.Request) {
  2970  		wantTrailer := http.Header{
  2971  			"Foo": nil,
  2972  			"Bar": nil,
  2973  			"Baz": nil,
  2974  		}
  2975  		if !reflect.DeepEqual(r.Trailer, wantTrailer) {
  2976  			t.Errorf("initial Trailer = %v; want %v", r.Trailer, wantTrailer)
  2977  		}
  2978  		slurp, err := io.ReadAll(r.Body)
  2979  		if string(slurp) != testBody {
  2980  			t.Errorf("read body %q; want %q", slurp, testBody)
  2981  		}
  2982  		if err != nil {
  2983  			t.Fatalf("Body slurp: %v", err)
  2984  		}
  2985  		wantTrailerAfter := http.Header{
  2986  			"Foo": {"foov"},
  2987  			"Bar": {"barv"},
  2988  			"Baz": {"bazv"},
  2989  		}
  2990  		if !reflect.DeepEqual(r.Trailer, wantTrailerAfter) {
  2991  			t.Errorf("final Trailer = %v; want %v", r.Trailer, wantTrailerAfter)
  2992  		}
  2993  	}
  2994  	testServerRequest(t, writeReq, checkReq)
  2995  }
  2996  
  2997  // test that a server handler can send trailers
  2998  func TestServerWritesTrailers_WithFlush(t *testing.T) {
  2999  	synctest.Test(t, func(t *testing.T) {
  3000  		testServerWritesTrailers(t, true)
  3001  	})
  3002  }
  3003  func TestServerWritesTrailers_WithoutFlush(t *testing.T) {
  3004  	synctest.Test(t, func(t *testing.T) {
  3005  		testServerWritesTrailers(t, false)
  3006  	})
  3007  }
  3008  
  3009  func testServerWritesTrailers(t *testing.T, withFlush bool) {
  3010  	// See https://httpwg.github.io/specs/rfc7540.html#rfc.section.8.1.3
  3011  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  3012  		w.Header().Set("Trailer", "Server-Trailer-A, Server-Trailer-B")
  3013  		w.Header().Add("Trailer", "Server-Trailer-C")
  3014  		w.Header().Add("Trailer", "Transfer-Encoding, Content-Length, Trailer") // filtered
  3015  
  3016  		// Regular headers:
  3017  		w.Header().Set("Foo", "Bar")
  3018  		w.Header().Set("Content-Length", "5") // len("Hello")
  3019  
  3020  		io.WriteString(w, "Hello")
  3021  		if withFlush {
  3022  			w.(http.Flusher).Flush()
  3023  		}
  3024  		w.Header().Set("Server-Trailer-A", "valuea")
  3025  		w.Header().Set("Server-Trailer-C", "valuec") // skipping B
  3026  		// After a flush, random keys like Server-Surprise shouldn't show up:
  3027  		w.Header().Set("Server-Surpise", "surprise! this isn't predeclared!")
  3028  		// But we do permit promoting keys to trailers after a
  3029  		// flush if they start with the magic
  3030  		// otherwise-invalid "Trailer:" prefix:
  3031  		w.Header().Set("Trailer:Post-Header-Trailer", "hi1")
  3032  		w.Header().Set("Trailer:post-header-trailer2", "hi2")
  3033  		w.Header().Set("Trailer:Range", "invalid")
  3034  		w.Header().Set("Trailer:Foo\x01Bogus", "invalid")
  3035  		w.Header().Set("Transfer-Encoding", "should not be included; Forbidden by RFC 7230 4.1.2")
  3036  		w.Header().Set("Content-Length", "should not be included; Forbidden by RFC 7230 4.1.2")
  3037  		w.Header().Set("Trailer", "should not be included; Forbidden by RFC 7230 4.1.2")
  3038  		return nil
  3039  	}, func(st *serverTester) {
  3040  		// Ignore errors from writing invalid trailers.
  3041  		st.h1server.ErrorLog = log.New(io.Discard, "", 0)
  3042  		getSlash(st)
  3043  		st.wantHeaders(wantHeader{
  3044  			streamID:  1,
  3045  			endStream: false,
  3046  			header: http.Header{
  3047  				":status": []string{"200"},
  3048  				"foo":     []string{"Bar"},
  3049  				"trailer": []string{
  3050  					"Server-Trailer-A, Server-Trailer-B",
  3051  					"Server-Trailer-C",
  3052  					"Transfer-Encoding, Content-Length, Trailer",
  3053  				},
  3054  				"content-type":   []string{"text/plain; charset=utf-8"},
  3055  				"content-length": []string{"5"},
  3056  			},
  3057  		})
  3058  		st.wantData(wantData{
  3059  			streamID:  1,
  3060  			endStream: false,
  3061  			data:      []byte("Hello"),
  3062  		})
  3063  		st.wantHeaders(wantHeader{
  3064  			streamID:  1,
  3065  			endStream: true,
  3066  			header: http.Header{
  3067  				"post-header-trailer":  []string{"hi1"},
  3068  				"post-header-trailer2": []string{"hi2"},
  3069  				"server-trailer-a":     []string{"valuea"},
  3070  				"server-trailer-c":     []string{"valuec"},
  3071  			},
  3072  		})
  3073  	})
  3074  }
  3075  
  3076  func TestServerWritesUndeclaredTrailers(t *testing.T) {
  3077  	synctest.Test(t, testServerWritesUndeclaredTrailers)
  3078  }
  3079  func testServerWritesUndeclaredTrailers(t *testing.T) {
  3080  	const trailer = "Trailer-Header"
  3081  	const value = "hi1"
  3082  	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  3083  		w.Header().Set(http.TrailerPrefix+trailer, value)
  3084  	})
  3085  
  3086  	tr := &http.Transport{
  3087  		TLSClientConfig: tlsConfigInsecure,
  3088  		Protocols:       protocols("h2"),
  3089  	}
  3090  	defer tr.CloseIdleConnections()
  3091  
  3092  	cl := &http.Client{Transport: tr}
  3093  	resp, err := cl.Get(ts.URL)
  3094  	if err != nil {
  3095  		t.Fatal(err)
  3096  	}
  3097  	io.Copy(io.Discard, resp.Body)
  3098  	resp.Body.Close()
  3099  
  3100  	if got, want := resp.Trailer.Get(trailer), value; got != want {
  3101  		t.Errorf("trailer %v = %q, want %q", trailer, got, want)
  3102  	}
  3103  }
  3104  
  3105  // validate transmitted header field names & values
  3106  // golang.org/issue/14048
  3107  func TestServerDoesntWriteInvalidHeaders(t *testing.T) {
  3108  	synctest.Test(t, testServerDoesntWriteInvalidHeaders)
  3109  }
  3110  func testServerDoesntWriteInvalidHeaders(t *testing.T) {
  3111  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  3112  		w.Header().Add("OK1", "x")
  3113  		w.Header().Add("Bad:Colon", "x") // colon (non-token byte) in key
  3114  		w.Header().Add("Bad1\x00", "x")  // null in key
  3115  		w.Header().Add("Bad2", "x\x00y") // null in value
  3116  		return nil
  3117  	}, func(st *serverTester) {
  3118  		getSlash(st)
  3119  		st.wantHeaders(wantHeader{
  3120  			streamID:  1,
  3121  			endStream: true,
  3122  			header: http.Header{
  3123  				":status":        []string{"200"},
  3124  				"ok1":            []string{"x"},
  3125  				"content-length": []string{"0"},
  3126  			},
  3127  		})
  3128  	})
  3129  }
  3130  
  3131  func TestIssue53(t *testing.T) { synctest.Test(t, testIssue53) }
  3132  func testIssue53(t *testing.T) {
  3133  	const data = "PRI * HTTP/2.0\r\n\r\nSM" +
  3134  		"\r\n\r\n\x00\x00\x00\x01\ainfinfin\ad"
  3135  	st := newServerTester(t, func(w http.ResponseWriter, req *http.Request) {
  3136  		w.Write([]byte("hello"))
  3137  	})
  3138  
  3139  	st.cc.Write([]byte(data))
  3140  	st.wantFrameType(FrameSettings)
  3141  	st.wantFrameType(FrameWindowUpdate)
  3142  	st.wantFrameType(FrameGoAway)
  3143  	time.Sleep(GoAwayTimeout)
  3144  	st.wantClosed()
  3145  }
  3146  
  3147  func TestServerServeNoBannedCiphers(t *testing.T) {
  3148  	tests := []struct {
  3149  		name      string
  3150  		tlsConfig *tls.Config
  3151  		wantErr   string
  3152  	}{
  3153  		{
  3154  			name:      "empty CipherSuites",
  3155  			tlsConfig: &tls.Config{},
  3156  		},
  3157  		{
  3158  			name: "bad CipherSuites but MinVersion TLS 1.3",
  3159  			tlsConfig: &tls.Config{
  3160  				MinVersion:   tls.VersionTLS13,
  3161  				CipherSuites: []uint16{tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384},
  3162  			},
  3163  		},
  3164  		{
  3165  			name: "just the required cipher suite",
  3166  			tlsConfig: &tls.Config{
  3167  				CipherSuites: []uint16{tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256},
  3168  			},
  3169  		},
  3170  		{
  3171  			name: "just the alternative required cipher suite",
  3172  			tlsConfig: &tls.Config{
  3173  				CipherSuites: []uint16{tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  3174  			},
  3175  		},
  3176  		{
  3177  			name: "missing required cipher suite",
  3178  			tlsConfig: &tls.Config{
  3179  				CipherSuites: []uint16{tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384},
  3180  			},
  3181  			wantErr: "is missing an HTTP/2-required",
  3182  		},
  3183  		{
  3184  			name: "required after bad",
  3185  			tlsConfig: &tls.Config{
  3186  				CipherSuites: []uint16{tls.TLS_RSA_WITH_RC4_128_SHA, tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256},
  3187  			},
  3188  		},
  3189  		{
  3190  			name: "bad after required",
  3191  			tlsConfig: &tls.Config{
  3192  				CipherSuites: []uint16{tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, tls.TLS_RSA_WITH_RC4_128_SHA},
  3193  			},
  3194  		},
  3195  	}
  3196  	for _, tt := range tests {
  3197  		tt.tlsConfig.Certificates = testServerTLSConfig.Certificates
  3198  
  3199  		srv := &http.Server{
  3200  			TLSConfig: tt.tlsConfig,
  3201  			Protocols: protocols("h2"),
  3202  		}
  3203  
  3204  		err := srv.ServeTLS(errListener{}, "", "")
  3205  		if (err != net.ErrClosed) != (tt.wantErr != "") {
  3206  			if tt.wantErr != "" {
  3207  				t.Errorf("%s: success, but want error", tt.name)
  3208  			} else {
  3209  				t.Errorf("%s: unexpected error: %v", tt.name, err)
  3210  			}
  3211  		}
  3212  		if err != nil && tt.wantErr != "" && !strings.Contains(err.Error(), tt.wantErr) {
  3213  			t.Errorf("%s: err = %v; want substring %q", tt.name, err, tt.wantErr)
  3214  		}
  3215  		if err == nil && !srv.TLSConfig.PreferServerCipherSuites {
  3216  			t.Errorf("%s: PreferServerCipherSuite is false; want true", tt.name)
  3217  		}
  3218  	}
  3219  }
  3220  
  3221  type errListener struct{}
  3222  
  3223  func (li errListener) Accept() (net.Conn, error) { return nil, net.ErrClosed }
  3224  func (li errListener) Close() error              { return nil }
  3225  func (li errListener) Addr() net.Addr            { return nil }
  3226  
  3227  func TestServerNoAutoContentLengthOnHead(t *testing.T) {
  3228  	synctest.Test(t, testServerNoAutoContentLengthOnHead)
  3229  }
  3230  func testServerNoAutoContentLengthOnHead(t *testing.T) {
  3231  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3232  		// No response body. (or smaller than one frame)
  3233  	})
  3234  	defer st.Close()
  3235  	st.greet()
  3236  	st.writeHeaders(HeadersFrameParam{
  3237  		StreamID:      1, // clients send odd numbers
  3238  		BlockFragment: st.encodeHeader(":method", "HEAD"),
  3239  		EndStream:     true,
  3240  		EndHeaders:    true,
  3241  	})
  3242  	st.wantHeaders(wantHeader{
  3243  		streamID:  1,
  3244  		endStream: true,
  3245  		header: http.Header{
  3246  			":status": []string{"200"},
  3247  		},
  3248  	})
  3249  }
  3250  
  3251  // golang.org/issue/13495
  3252  func TestServerNoDuplicateContentType(t *testing.T) {
  3253  	synctest.Test(t, testServerNoDuplicateContentType)
  3254  }
  3255  func testServerNoDuplicateContentType(t *testing.T) {
  3256  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3257  		w.Header()["Content-Type"] = []string{""}
  3258  		fmt.Fprintf(w, "<html><head></head><body>hi</body></html>")
  3259  	})
  3260  	defer st.Close()
  3261  	st.greet()
  3262  	st.writeHeaders(HeadersFrameParam{
  3263  		StreamID:      1,
  3264  		BlockFragment: st.encodeHeader(),
  3265  		EndStream:     true,
  3266  		EndHeaders:    true,
  3267  	})
  3268  	st.wantHeaders(wantHeader{
  3269  		streamID:  1,
  3270  		endStream: false,
  3271  		header: http.Header{
  3272  			":status":        []string{"200"},
  3273  			"content-type":   []string{""},
  3274  			"content-length": []string{"41"},
  3275  		},
  3276  	})
  3277  }
  3278  
  3279  func TestServerContentLengthCanBeDisabled(t *testing.T) {
  3280  	synctest.Test(t, testServerContentLengthCanBeDisabled)
  3281  }
  3282  func testServerContentLengthCanBeDisabled(t *testing.T) {
  3283  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3284  		w.Header()["Content-Length"] = nil
  3285  		fmt.Fprintf(w, "OK")
  3286  	})
  3287  	defer st.Close()
  3288  	st.greet()
  3289  	st.writeHeaders(HeadersFrameParam{
  3290  		StreamID:      1,
  3291  		BlockFragment: st.encodeHeader(),
  3292  		EndStream:     true,
  3293  		EndHeaders:    true,
  3294  	})
  3295  	st.wantHeaders(wantHeader{
  3296  		streamID:  1,
  3297  		endStream: false,
  3298  		header: http.Header{
  3299  			":status":      []string{"200"},
  3300  			"content-type": []string{"text/plain; charset=utf-8"},
  3301  		},
  3302  	})
  3303  }
  3304  
  3305  // golang.org/issue/14214
  3306  func TestServer_Rejects_ConnHeaders(t *testing.T) { synctest.Test(t, testServer_Rejects_ConnHeaders) }
  3307  func testServer_Rejects_ConnHeaders(t *testing.T) {
  3308  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3309  		t.Error("should not get to Handler")
  3310  	})
  3311  	defer st.Close()
  3312  	st.greet()
  3313  	st.bodylessReq1("connection", "foo")
  3314  	st.wantHeaders(wantHeader{
  3315  		streamID:  1,
  3316  		endStream: false,
  3317  		header: http.Header{
  3318  			":status":                []string{"400"},
  3319  			"content-type":           []string{"text/plain; charset=utf-8"},
  3320  			"x-content-type-options": []string{"nosniff"},
  3321  			"content-length":         []string{"51"},
  3322  		},
  3323  	})
  3324  }
  3325  
  3326  type hpackEncoder struct {
  3327  	enc *hpack.Encoder
  3328  	buf bytes.Buffer
  3329  }
  3330  
  3331  func (he *hpackEncoder) encodeHeaderRaw(t *testing.T, headers ...string) []byte {
  3332  	if len(headers)%2 == 1 {
  3333  		panic("odd number of kv args")
  3334  	}
  3335  	he.buf.Reset()
  3336  	if he.enc == nil {
  3337  		he.enc = hpack.NewEncoder(&he.buf)
  3338  	}
  3339  	for len(headers) > 0 {
  3340  		k, v := headers[0], headers[1]
  3341  		err := he.enc.WriteField(hpack.HeaderField{Name: k, Value: v})
  3342  		if err != nil {
  3343  			t.Fatalf("HPACK encoding error for %q/%q: %v", k, v, err)
  3344  		}
  3345  		headers = headers[2:]
  3346  	}
  3347  	return he.buf.Bytes()
  3348  }
  3349  
  3350  // golang.org/issue/14030
  3351  func TestExpect100ContinueAfterHandlerWrites(t *testing.T) {
  3352  	synctest.Test(t, testExpect100ContinueAfterHandlerWrites)
  3353  }
  3354  func testExpect100ContinueAfterHandlerWrites(t *testing.T) {
  3355  	const msg = "Hello"
  3356  	const msg2 = "World"
  3357  
  3358  	doRead := make(chan bool, 1)
  3359  	defer close(doRead) // fallback cleanup
  3360  
  3361  	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  3362  		io.WriteString(w, msg)
  3363  		w.(http.Flusher).Flush()
  3364  
  3365  		// Do a read, which might force a 100-continue status to be sent.
  3366  		<-doRead
  3367  		r.Body.Read(make([]byte, 10))
  3368  
  3369  		io.WriteString(w, msg2)
  3370  	})
  3371  
  3372  	tr := &http.Transport{
  3373  		TLSClientConfig: tlsConfigInsecure,
  3374  		Protocols:       protocols("h2"),
  3375  	}
  3376  	defer tr.CloseIdleConnections()
  3377  
  3378  	req, _ := http.NewRequest("POST", ts.URL, io.LimitReader(neverEnding('A'), 2<<20))
  3379  	req.Header.Set("Expect", "100-continue")
  3380  
  3381  	res, err := tr.RoundTrip(req)
  3382  	if err != nil {
  3383  		t.Fatal(err)
  3384  	}
  3385  	defer res.Body.Close()
  3386  
  3387  	buf := make([]byte, len(msg))
  3388  	if _, err := io.ReadFull(res.Body, buf); err != nil {
  3389  		t.Fatal(err)
  3390  	}
  3391  	if string(buf) != msg {
  3392  		t.Fatalf("msg = %q; want %q", buf, msg)
  3393  	}
  3394  
  3395  	doRead <- true
  3396  
  3397  	if _, err := io.ReadFull(res.Body, buf); err != nil {
  3398  		t.Fatal(err)
  3399  	}
  3400  	if string(buf) != msg2 {
  3401  		t.Fatalf("second msg = %q; want %q", buf, msg2)
  3402  	}
  3403  }
  3404  
  3405  type funcReader func([]byte) (n int, err error)
  3406  
  3407  func (f funcReader) Read(p []byte) (n int, err error) { return f(p) }
  3408  
  3409  // golang.org/issue/16481 -- return flow control when streams close with unread data.
  3410  // (The Server version of the bug. See also TestUnreadFlowControlReturned_Transport)
  3411  func TestUnreadFlowControlReturned_Server(t *testing.T) {
  3412  	for _, tt := range []struct {
  3413  		name  string
  3414  		reqFn func(r *http.Request)
  3415  	}{
  3416  		{
  3417  			"body-open",
  3418  			func(r *http.Request) {},
  3419  		},
  3420  		{
  3421  			"body-closed",
  3422  			func(r *http.Request) {
  3423  				r.Body.Close()
  3424  			},
  3425  		},
  3426  		{
  3427  			"read-1-byte-and-close",
  3428  			func(r *http.Request) {
  3429  				b := make([]byte, 1)
  3430  				r.Body.Read(b)
  3431  				r.Body.Close()
  3432  			},
  3433  		},
  3434  	} {
  3435  		synctestSubtest(t, tt.name, func(t *testing.T) {
  3436  			unblock := make(chan bool, 1)
  3437  			defer close(unblock)
  3438  
  3439  			ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  3440  				// Don't read the 16KB request body. Wait until the client's
  3441  				// done sending it and then return. This should cause the Server
  3442  				// to then return those 16KB of flow control to the client.
  3443  				tt.reqFn(r)
  3444  				<-unblock
  3445  			})
  3446  
  3447  			tr := &http.Transport{
  3448  				TLSClientConfig: tlsConfigInsecure,
  3449  				Protocols:       protocols("h2"),
  3450  			}
  3451  			defer tr.CloseIdleConnections()
  3452  
  3453  			// This previously hung on the 4th iteration.
  3454  			iters := 100
  3455  			if testing.Short() {
  3456  				iters = 20
  3457  			}
  3458  			for i := 0; i < iters; i++ {
  3459  				body := io.MultiReader(
  3460  					io.LimitReader(neverEnding('A'), 16<<10),
  3461  					funcReader(func([]byte) (n int, err error) {
  3462  						unblock <- true
  3463  						return 0, io.EOF
  3464  					}),
  3465  				)
  3466  				req, _ := http.NewRequest("POST", ts.URL, body)
  3467  				res, err := tr.RoundTrip(req)
  3468  				if err != nil {
  3469  					t.Fatal(tt.name, err)
  3470  				}
  3471  				res.Body.Close()
  3472  			}
  3473  		})
  3474  	}
  3475  }
  3476  
  3477  func TestServerReturnsStreamAndConnFlowControlOnBodyClose(t *testing.T) {
  3478  	synctest.Test(t, testServerReturnsStreamAndConnFlowControlOnBodyClose)
  3479  }
  3480  func testServerReturnsStreamAndConnFlowControlOnBodyClose(t *testing.T) {
  3481  	unblockHandler := make(chan struct{})
  3482  	defer close(unblockHandler)
  3483  
  3484  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3485  		r.Body.Close()
  3486  		w.WriteHeader(200)
  3487  		w.(http.Flusher).Flush()
  3488  		<-unblockHandler
  3489  	})
  3490  	defer st.Close()
  3491  
  3492  	st.greet()
  3493  	st.writeHeaders(HeadersFrameParam{
  3494  		StreamID:      1,
  3495  		BlockFragment: st.encodeHeader(),
  3496  		EndHeaders:    true,
  3497  	})
  3498  	st.wantHeaders(wantHeader{
  3499  		streamID:  1,
  3500  		endStream: false,
  3501  	})
  3502  	const size = InflowMinRefresh // enough to trigger flow control return
  3503  	st.writeData(1, false, make([]byte, size))
  3504  	st.wantWindowUpdate(0, size) // conn-level flow control is returned
  3505  	unblockHandler <- struct{}{}
  3506  	st.wantData(wantData{
  3507  		streamID:  1,
  3508  		endStream: true,
  3509  	})
  3510  }
  3511  
  3512  func TestServerIdleTimeout(t *testing.T) { synctest.Test(t, testServerIdleTimeout) }
  3513  func testServerIdleTimeout(t *testing.T) {
  3514  	if testing.Short() {
  3515  		t.Skip("skipping in short mode")
  3516  	}
  3517  
  3518  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3519  	}, func(s *http.Server) {
  3520  		s.IdleTimeout = 500 * time.Millisecond
  3521  	})
  3522  	defer st.Close()
  3523  
  3524  	st.greet()
  3525  	st.advance(500 * time.Millisecond)
  3526  	st.wantGoAway(0, ErrCodeNo)
  3527  }
  3528  
  3529  func TestServerIdleTimeout_AfterRequest(t *testing.T) {
  3530  	synctest.Test(t, testServerIdleTimeout_AfterRequest)
  3531  }
  3532  func testServerIdleTimeout_AfterRequest(t *testing.T) {
  3533  	if testing.Short() {
  3534  		t.Skip("skipping in short mode")
  3535  	}
  3536  	const (
  3537  		requestTimeout = 2 * time.Second
  3538  		idleTimeout    = 1 * time.Second
  3539  	)
  3540  
  3541  	var st *serverTester
  3542  	st = newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3543  		time.Sleep(requestTimeout)
  3544  	}, func(s *http.Server) {
  3545  		s.IdleTimeout = idleTimeout
  3546  	})
  3547  	defer st.Close()
  3548  
  3549  	st.greet()
  3550  
  3551  	// Send a request which takes twice the timeout. Verifies the
  3552  	// idle timeout doesn't fire while we're in a request:
  3553  	st.bodylessReq1()
  3554  	st.advance(requestTimeout)
  3555  	st.wantHeaders(wantHeader{
  3556  		streamID:  1,
  3557  		endStream: true,
  3558  	})
  3559  
  3560  	// But the idle timeout should be rearmed after the request
  3561  	// is done:
  3562  	st.advance(idleTimeout)
  3563  	st.wantGoAway(1, ErrCodeNo)
  3564  }
  3565  
  3566  // grpc-go closes the Request.Body currently with a Read.
  3567  // Verify that it doesn't race.
  3568  // See https://github.com/grpc/grpc-go/pull/938
  3569  func TestRequestBodyReadCloseRace(t *testing.T) { synctest.Test(t, testRequestBodyReadCloseRace) }
  3570  func testRequestBodyReadCloseRace(t *testing.T) {
  3571  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3572  		go r.Body.Close()
  3573  		io.Copy(io.Discard, r.Body)
  3574  	})
  3575  	st.greet()
  3576  
  3577  	data := make([]byte, 1024)
  3578  	for i := range 100 {
  3579  		streamID := uint32(1 + (i * 2)) // clients send odd numbers
  3580  		st.writeHeaders(HeadersFrameParam{
  3581  			StreamID:      streamID,
  3582  			BlockFragment: st.encodeHeader(),
  3583  			EndHeaders:    true,
  3584  		})
  3585  		st.writeData(1, false, data)
  3586  
  3587  		for {
  3588  			// Look for a RST_STREAM frame.
  3589  			// Skip over anything else (HEADERS and WINDOW_UPDATE).
  3590  			fr := st.readFrame()
  3591  			if fr == nil {
  3592  				t.Fatalf("got no RSTStreamFrame, want one")
  3593  			}
  3594  			rst, ok := fr.(*RSTStreamFrame)
  3595  			if !ok {
  3596  				continue
  3597  			}
  3598  			// We can get NO or STREAM_CLOSED depending on scheduling.
  3599  			if rst.ErrCode != ErrCodeNo && rst.ErrCode != ErrCodeStreamClosed {
  3600  				t.Fatalf("got RSTStreamFrame with error code %v, want ErrCodeNo or ErrCodeStreamClosed", rst.ErrCode)
  3601  			}
  3602  			break
  3603  		}
  3604  	}
  3605  }
  3606  
  3607  func TestIssue20704Race(t *testing.T) { synctest.Test(t, testIssue20704Race) }
  3608  func testIssue20704Race(t *testing.T) {
  3609  	if testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
  3610  		t.Skip("skipping in short mode")
  3611  	}
  3612  	const (
  3613  		itemSize  = 1 << 10
  3614  		itemCount = 100
  3615  	)
  3616  
  3617  	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  3618  		for range itemCount {
  3619  			_, err := w.Write(make([]byte, itemSize))
  3620  			if err != nil {
  3621  				return
  3622  			}
  3623  		}
  3624  	})
  3625  
  3626  	tr := &http.Transport{
  3627  		TLSClientConfig: tlsConfigInsecure,
  3628  		Protocols:       protocols("h2"),
  3629  	}
  3630  	defer tr.CloseIdleConnections()
  3631  	cl := &http.Client{Transport: tr}
  3632  
  3633  	for range 1000 {
  3634  		resp, err := cl.Get(ts.URL)
  3635  		if err != nil {
  3636  			t.Fatal(err)
  3637  		}
  3638  		// Force a RST stream to the server by closing without
  3639  		// reading the body:
  3640  		resp.Body.Close()
  3641  	}
  3642  }
  3643  
  3644  func TestServer_Rejects_TooSmall(t *testing.T) { synctest.Test(t, testServer_Rejects_TooSmall) }
  3645  func testServer_Rejects_TooSmall(t *testing.T) {
  3646  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  3647  		io.ReadAll(r.Body)
  3648  		return nil
  3649  	}, func(st *serverTester) {
  3650  		st.writeHeaders(HeadersFrameParam{
  3651  			StreamID: 1, // clients send odd numbers
  3652  			BlockFragment: st.encodeHeader(
  3653  				":method", "POST",
  3654  				"content-length", "4",
  3655  			),
  3656  			EndStream:  false, // to say DATA frames are coming
  3657  			EndHeaders: true,
  3658  		})
  3659  		st.writeData(1, true, []byte("12345"))
  3660  		st.wantRSTStream(1, ErrCodeProtocol)
  3661  		st.wantConnFlowControlConsumed(0)
  3662  	})
  3663  }
  3664  
  3665  // Tests that a handler setting "Connection: close" results in a GOAWAY being sent,
  3666  // and the connection still completing.
  3667  func TestServerHandlerConnectionClose(t *testing.T) {
  3668  	synctest.Test(t, testServerHandlerConnectionClose)
  3669  }
  3670  func testServerHandlerConnectionClose(t *testing.T) {
  3671  	unblockHandler := make(chan bool, 1)
  3672  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  3673  		w.Header().Set("Connection", "close")
  3674  		w.Header().Set("Foo", "bar")
  3675  		w.(http.Flusher).Flush()
  3676  		<-unblockHandler
  3677  		return nil
  3678  	}, func(st *serverTester) {
  3679  		defer close(unblockHandler) // backup; in case of errors
  3680  		st.writeHeaders(HeadersFrameParam{
  3681  			StreamID:      1,
  3682  			BlockFragment: st.encodeHeader(),
  3683  			EndStream:     true,
  3684  			EndHeaders:    true,
  3685  		})
  3686  		var sawGoAway bool
  3687  		var sawRes bool
  3688  		var sawWindowUpdate bool
  3689  		for {
  3690  			f := st.readFrame()
  3691  			if f == nil {
  3692  				break
  3693  			}
  3694  			switch f := f.(type) {
  3695  			case *GoAwayFrame:
  3696  				sawGoAway = true
  3697  				if f.LastStreamID != 1 || f.ErrCode != ErrCodeNo {
  3698  					t.Errorf("unexpected GOAWAY frame: %v", SummarizeFrame(f))
  3699  				}
  3700  				// Create a stream and reset it.
  3701  				// The server should ignore the stream.
  3702  				st.writeHeaders(HeadersFrameParam{
  3703  					StreamID:      3,
  3704  					BlockFragment: st.encodeHeader(),
  3705  					EndStream:     false,
  3706  					EndHeaders:    true,
  3707  				})
  3708  				st.fr.WriteRSTStream(3, ErrCodeCancel)
  3709  				// Create a stream and send data to it.
  3710  				// The server should return flow control, even though it
  3711  				// does not process the stream.
  3712  				st.writeHeaders(HeadersFrameParam{
  3713  					StreamID:      5,
  3714  					BlockFragment: st.encodeHeader(),
  3715  					EndStream:     false,
  3716  					EndHeaders:    true,
  3717  				})
  3718  				// Write enough data to trigger a window update.
  3719  				st.writeData(5, true, make([]byte, 1<<19))
  3720  			case *HeadersFrame:
  3721  				goth := st.decodeHeader(f.HeaderBlockFragment())
  3722  				wanth := [][2]string{
  3723  					{":status", "200"},
  3724  					{"foo", "bar"},
  3725  				}
  3726  				if !reflect.DeepEqual(goth, wanth) {
  3727  					t.Errorf("got headers %v; want %v", goth, wanth)
  3728  				}
  3729  				sawRes = true
  3730  			case *DataFrame:
  3731  				if f.StreamID != 1 || !f.StreamEnded() || len(f.Data()) != 0 {
  3732  					t.Errorf("unexpected DATA frame: %v", SummarizeFrame(f))
  3733  				}
  3734  			case *WindowUpdateFrame:
  3735  				if !sawGoAway {
  3736  					t.Errorf("unexpected WINDOW_UPDATE frame: %v", SummarizeFrame(f))
  3737  					return
  3738  				}
  3739  				if f.StreamID != 0 {
  3740  					st.t.Fatalf("WindowUpdate StreamID = %d; want 5", f.FrameHeader.StreamID)
  3741  					return
  3742  				}
  3743  				sawWindowUpdate = true
  3744  				unblockHandler <- true
  3745  				st.sync()
  3746  				st.advance(GoAwayTimeout)
  3747  			default:
  3748  				t.Logf("unexpected frame: %v", SummarizeFrame(f))
  3749  			}
  3750  		}
  3751  		if !sawGoAway {
  3752  			t.Errorf("didn't see GOAWAY")
  3753  		}
  3754  		if !sawRes {
  3755  			t.Errorf("didn't see response")
  3756  		}
  3757  		if !sawWindowUpdate {
  3758  			t.Errorf("didn't see WINDOW_UPDATE")
  3759  		}
  3760  	})
  3761  }
  3762  
  3763  func TestServer_Headers_HalfCloseRemote(t *testing.T) {
  3764  	synctest.Test(t, testServer_Headers_HalfCloseRemote)
  3765  }
  3766  func testServer_Headers_HalfCloseRemote(t *testing.T) {
  3767  	var st *serverTester
  3768  	writeData := make(chan bool)
  3769  	writeHeaders := make(chan bool)
  3770  	leaveHandler := make(chan bool)
  3771  	st = newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3772  		if !st.streamExists(1) {
  3773  			t.Errorf("stream 1 does not exist in handler")
  3774  		}
  3775  		if got, want := st.streamState(1), StateOpen; got != want {
  3776  			t.Errorf("in handler, state is %v; want %v", got, want)
  3777  		}
  3778  		writeData <- true
  3779  		if n, err := r.Body.Read(make([]byte, 1)); n != 0 || err != io.EOF {
  3780  			t.Errorf("body read = %d, %v; want 0, EOF", n, err)
  3781  		}
  3782  		if got, want := st.streamState(1), StateHalfClosedRemote; got != want {
  3783  			t.Errorf("in handler, state is %v; want %v", got, want)
  3784  		}
  3785  		writeHeaders <- true
  3786  
  3787  		<-leaveHandler
  3788  	})
  3789  	st.greet()
  3790  
  3791  	st.writeHeaders(HeadersFrameParam{
  3792  		StreamID:      1,
  3793  		BlockFragment: st.encodeHeader(),
  3794  		EndStream:     false, // keep it open
  3795  		EndHeaders:    true,
  3796  	})
  3797  	<-writeData
  3798  	st.writeData(1, true, nil)
  3799  
  3800  	<-writeHeaders
  3801  
  3802  	st.writeHeaders(HeadersFrameParam{
  3803  		StreamID:      1,
  3804  		BlockFragment: st.encodeHeader(),
  3805  		EndStream:     false, // keep it open
  3806  		EndHeaders:    true,
  3807  	})
  3808  
  3809  	defer close(leaveHandler)
  3810  
  3811  	st.wantRSTStream(1, ErrCodeStreamClosed)
  3812  }
  3813  
  3814  func TestServerGracefulShutdown(t *testing.T) { synctest.Test(t, testServerGracefulShutdown) }
  3815  func testServerGracefulShutdown(t *testing.T) {
  3816  	handlerDone := make(chan struct{})
  3817  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3818  		<-handlerDone
  3819  		w.Header().Set("x-foo", "bar")
  3820  	})
  3821  	defer st.Close()
  3822  
  3823  	st.greet()
  3824  	st.bodylessReq1()
  3825  
  3826  	st.sync()
  3827  
  3828  	shutdownc := make(chan struct{})
  3829  	go func() {
  3830  		defer close(shutdownc)
  3831  		st.h1server.Shutdown(context.Background())
  3832  	}()
  3833  
  3834  	st.wantGoAway(1, ErrCodeNo)
  3835  
  3836  	close(handlerDone)
  3837  	st.sync()
  3838  
  3839  	st.wantHeaders(wantHeader{
  3840  		streamID:  1,
  3841  		endStream: true,
  3842  		header: http.Header{
  3843  			":status":        []string{"200"},
  3844  			"x-foo":          []string{"bar"},
  3845  			"content-length": []string{"0"},
  3846  		},
  3847  	})
  3848  
  3849  	n, err := st.cc.Read([]byte{0})
  3850  	if n != 0 || err == nil {
  3851  		t.Errorf("Read = %v, %v; want 0, non-nil", n, err)
  3852  	}
  3853  
  3854  	// Shutdown happens after GoAwayTimeout and net/http.Server polling delay.
  3855  	<-shutdownc
  3856  }
  3857  
  3858  // Issue 31753: don't sniff when Content-Encoding is set
  3859  func TestContentEncodingNoSniffing(t *testing.T) {
  3860  	type resp struct {
  3861  		name string
  3862  		body []byte
  3863  		// setting Content-Encoding as an interface instead of a string
  3864  		// directly, so as to differentiate between 3 states:
  3865  		//    unset, empty string "" and set string "foo/bar".
  3866  		contentEncoding any
  3867  		wantContentType string
  3868  	}
  3869  
  3870  	resps := []*resp{
  3871  		{
  3872  			name:            "gzip content-encoding, gzipped", // don't sniff.
  3873  			contentEncoding: "application/gzip",
  3874  			wantContentType: "",
  3875  			body: func() []byte {
  3876  				buf := new(bytes.Buffer)
  3877  				gzw := gzip.NewWriter(buf)
  3878  				gzw.Write([]byte("doctype html><p>Hello</p>"))
  3879  				gzw.Close()
  3880  				return buf.Bytes()
  3881  			}(),
  3882  		},
  3883  		{
  3884  			name:            "zlib content-encoding, zlibbed", // don't sniff.
  3885  			contentEncoding: "application/zlib",
  3886  			wantContentType: "",
  3887  			body: func() []byte {
  3888  				buf := new(bytes.Buffer)
  3889  				zw := zlib.NewWriter(buf)
  3890  				zw.Write([]byte("doctype html><p>Hello</p>"))
  3891  				zw.Close()
  3892  				return buf.Bytes()
  3893  			}(),
  3894  		},
  3895  		{
  3896  			name:            "no content-encoding", // must sniff.
  3897  			wantContentType: "application/x-gzip",
  3898  			body: func() []byte {
  3899  				buf := new(bytes.Buffer)
  3900  				gzw := gzip.NewWriter(buf)
  3901  				gzw.Write([]byte("doctype html><p>Hello</p>"))
  3902  				gzw.Close()
  3903  				return buf.Bytes()
  3904  			}(),
  3905  		},
  3906  		{
  3907  			name:            "phony content-encoding", // don't sniff.
  3908  			contentEncoding: "foo/bar",
  3909  			body:            []byte("doctype html><p>Hello</p>"),
  3910  		},
  3911  		{
  3912  			name:            "empty but set content-encoding",
  3913  			contentEncoding: "",
  3914  			wantContentType: "audio/mpeg",
  3915  			body:            []byte("ID3"),
  3916  		},
  3917  	}
  3918  
  3919  	for _, tt := range resps {
  3920  		synctestSubtest(t, tt.name, func(t *testing.T) {
  3921  			ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  3922  				if tt.contentEncoding != nil {
  3923  					w.Header().Set("Content-Encoding", tt.contentEncoding.(string))
  3924  				}
  3925  				w.Write(tt.body)
  3926  			})
  3927  
  3928  			tr := &http.Transport{
  3929  				TLSClientConfig: tlsConfigInsecure,
  3930  				Protocols:       protocols("h2"),
  3931  			}
  3932  			defer tr.CloseIdleConnections()
  3933  
  3934  			req, _ := http.NewRequest("GET", ts.URL, nil)
  3935  			res, err := tr.RoundTrip(req)
  3936  			if err != nil {
  3937  				t.Fatalf("GET %s: %v", ts.URL, err)
  3938  			}
  3939  			defer res.Body.Close()
  3940  
  3941  			g := res.Header.Get("Content-Encoding")
  3942  			t.Logf("%s: Content-Encoding: %s", ts.URL, g)
  3943  
  3944  			if w := tt.contentEncoding; g != w {
  3945  				if w != nil { // The case where contentEncoding was set explicitly.
  3946  					t.Errorf("Content-Encoding mismatch\n\tgot:  %q\n\twant: %q", g, w)
  3947  				} else if g != "" { // "" should be the equivalent when the contentEncoding is unset.
  3948  					t.Errorf("Unexpected Content-Encoding %q", g)
  3949  				}
  3950  			}
  3951  
  3952  			g = res.Header.Get("Content-Type")
  3953  			if w := tt.wantContentType; g != w {
  3954  				t.Errorf("Content-Type mismatch\n\tgot:  %q\n\twant: %q", g, w)
  3955  			}
  3956  			t.Logf("%s: Content-Type: %s", ts.URL, g)
  3957  		})
  3958  	}
  3959  }
  3960  
  3961  func TestServerWindowUpdateOnBodyClose(t *testing.T) {
  3962  	synctest.Test(t, testServerWindowUpdateOnBodyClose)
  3963  }
  3964  func testServerWindowUpdateOnBodyClose(t *testing.T) {
  3965  	const windowSize = 65535 * 2
  3966  	content := make([]byte, windowSize)
  3967  	errc := make(chan error)
  3968  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  3969  		buf := make([]byte, 4)
  3970  		n, err := io.ReadFull(r.Body, buf)
  3971  		if err != nil {
  3972  			errc <- err
  3973  			return
  3974  		}
  3975  		if n != len(buf) {
  3976  			errc <- fmt.Errorf("too few bytes read: %d", n)
  3977  			return
  3978  		}
  3979  		r.Body.Close()
  3980  		errc <- nil
  3981  	}, func(h2 *http.HTTP2Config) {
  3982  		h2.MaxReceiveBufferPerConnection = windowSize
  3983  		h2.MaxReceiveBufferPerStream = windowSize
  3984  	})
  3985  	defer st.Close()
  3986  
  3987  	st.greet()
  3988  	st.writeHeaders(HeadersFrameParam{
  3989  		StreamID: 1, // clients send odd numbers
  3990  		BlockFragment: st.encodeHeader(
  3991  			":method", "POST",
  3992  			"content-length", strconv.Itoa(len(content)),
  3993  		),
  3994  		EndStream:  false, // to say DATA frames are coming
  3995  		EndHeaders: true,
  3996  	})
  3997  	st.writeData(1, false, content[:windowSize/2])
  3998  	if err := <-errc; err != nil {
  3999  		t.Fatal(err)
  4000  	}
  4001  
  4002  	// Wait for flow control credit for the portion of the request written so far.
  4003  	increments := windowSize / 2
  4004  	for {
  4005  		f := st.readFrame()
  4006  		if f == nil {
  4007  			break
  4008  		}
  4009  		if wu, ok := f.(*WindowUpdateFrame); ok && wu.StreamID == 0 {
  4010  			increments -= int(wu.Increment)
  4011  			if increments == 0 {
  4012  				break
  4013  			}
  4014  		}
  4015  	}
  4016  
  4017  	// Writing data after the stream is reset immediately returns flow control credit.
  4018  	st.writeData(1, false, content[windowSize/2:])
  4019  	st.wantWindowUpdate(0, windowSize/2)
  4020  }
  4021  
  4022  func TestNoErrorLoggedOnPostAfterGOAWAY(t *testing.T) {
  4023  	synctest.Test(t, testNoErrorLoggedOnPostAfterGOAWAY)
  4024  }
  4025  func testNoErrorLoggedOnPostAfterGOAWAY(t *testing.T) {
  4026  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {})
  4027  	defer st.Close()
  4028  
  4029  	st.greet()
  4030  
  4031  	content := "some content"
  4032  	st.writeHeaders(HeadersFrameParam{
  4033  		StreamID: 1,
  4034  		BlockFragment: st.encodeHeader(
  4035  			":method", "POST",
  4036  			"content-length", strconv.Itoa(len(content)),
  4037  		),
  4038  		EndStream:  false,
  4039  		EndHeaders: true,
  4040  	})
  4041  	st.wantHeaders(wantHeader{
  4042  		streamID:  1,
  4043  		endStream: true,
  4044  	})
  4045  
  4046  	st.sc.StartGracefulShutdown()
  4047  	st.wantRSTStream(1, ErrCodeNo)
  4048  	st.wantGoAway(1, ErrCodeNo)
  4049  
  4050  	st.writeData(1, true, []byte(content))
  4051  	st.Close()
  4052  
  4053  	if bytes.Contains(st.serverLogBuf.Bytes(), []byte("PROTOCOL_ERROR")) {
  4054  		t.Error("got protocol error")
  4055  	}
  4056  }
  4057  
  4058  func TestServerSendsProcessing(t *testing.T) { synctest.Test(t, testServerSendsProcessing) }
  4059  func testServerSendsProcessing(t *testing.T) {
  4060  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  4061  		w.WriteHeader(http.StatusProcessing)
  4062  		w.Write([]byte("stuff"))
  4063  
  4064  		return nil
  4065  	}, func(st *serverTester) {
  4066  		getSlash(st)
  4067  		st.wantHeaders(wantHeader{
  4068  			streamID:  1,
  4069  			endStream: false,
  4070  			header: http.Header{
  4071  				":status": []string{"102"},
  4072  			},
  4073  		})
  4074  		st.wantHeaders(wantHeader{
  4075  			streamID:  1,
  4076  			endStream: false,
  4077  			header: http.Header{
  4078  				":status":        []string{"200"},
  4079  				"content-type":   []string{"text/plain; charset=utf-8"},
  4080  				"content-length": []string{"5"},
  4081  			},
  4082  		})
  4083  	})
  4084  }
  4085  
  4086  func TestServerSendsEarlyHints(t *testing.T) { synctest.Test(t, testServerSendsEarlyHints) }
  4087  func testServerSendsEarlyHints(t *testing.T) {
  4088  	testServerResponse(t, func(w http.ResponseWriter, r *http.Request) error {
  4089  		h := w.Header()
  4090  		h.Add("Content-Length", "123")
  4091  		h.Add("Link", "</style.css>; rel=preload; as=style")
  4092  		h.Add("Link", "</script.js>; rel=preload; as=script")
  4093  		w.WriteHeader(http.StatusEarlyHints)
  4094  
  4095  		h.Add("Link", "</foo.js>; rel=preload; as=script")
  4096  		w.WriteHeader(http.StatusEarlyHints)
  4097  
  4098  		w.Write([]byte("stuff"))
  4099  
  4100  		return nil
  4101  	}, func(st *serverTester) {
  4102  		getSlash(st)
  4103  		st.wantHeaders(wantHeader{
  4104  			streamID:  1,
  4105  			endStream: false,
  4106  			header: http.Header{
  4107  				":status": []string{"103"},
  4108  				"link": []string{
  4109  					"</style.css>; rel=preload; as=style",
  4110  					"</script.js>; rel=preload; as=script",
  4111  				},
  4112  			},
  4113  		})
  4114  		st.wantHeaders(wantHeader{
  4115  			streamID:  1,
  4116  			endStream: false,
  4117  			header: http.Header{
  4118  				":status": []string{"103"},
  4119  				"link": []string{
  4120  					"</style.css>; rel=preload; as=style",
  4121  					"</script.js>; rel=preload; as=script",
  4122  					"</foo.js>; rel=preload; as=script",
  4123  				},
  4124  			},
  4125  		})
  4126  		st.wantHeaders(wantHeader{
  4127  			streamID:  1,
  4128  			endStream: false,
  4129  			header: http.Header{
  4130  				":status": []string{"200"},
  4131  				"link": []string{
  4132  					"</style.css>; rel=preload; as=style",
  4133  					"</script.js>; rel=preload; as=script",
  4134  					"</foo.js>; rel=preload; as=script",
  4135  				},
  4136  				"content-type":   []string{"text/plain; charset=utf-8"},
  4137  				"content-length": []string{"123"},
  4138  			},
  4139  		})
  4140  	})
  4141  }
  4142  
  4143  func TestProtocolErrorAfterGoAway(t *testing.T) { synctest.Test(t, testProtocolErrorAfterGoAway) }
  4144  func testProtocolErrorAfterGoAway(t *testing.T) {
  4145  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4146  		io.Copy(io.Discard, r.Body)
  4147  	})
  4148  	defer st.Close()
  4149  
  4150  	st.greet()
  4151  	content := "some content"
  4152  	st.writeHeaders(HeadersFrameParam{
  4153  		StreamID: 1,
  4154  		BlockFragment: st.encodeHeader(
  4155  			":method", "POST",
  4156  			"content-length", strconv.Itoa(len(content)),
  4157  		),
  4158  		EndStream:  false,
  4159  		EndHeaders: true,
  4160  	})
  4161  	st.writeData(1, false, []byte(content[:5]))
  4162  
  4163  	// Send a GOAWAY with ErrCodeNo, followed by a bogus window update.
  4164  	// The server should close the connection.
  4165  	if err := st.fr.WriteGoAway(1, ErrCodeNo, nil); err != nil {
  4166  		t.Fatal(err)
  4167  	}
  4168  	if err := st.fr.WriteWindowUpdate(0, 1<<31-1); err != nil {
  4169  		t.Fatal(err)
  4170  	}
  4171  
  4172  	st.advance(GoAwayTimeout)
  4173  	st.wantGoAway(1, ErrCodeNo)
  4174  	st.wantClosed()
  4175  }
  4176  
  4177  func TestServerInitialFlowControlWindow(t *testing.T) {
  4178  	for _, want := range []int32{
  4179  		65535,
  4180  		1 << 19,
  4181  		1 << 21,
  4182  		// For MaxUploadBufferPerConnection values in the range
  4183  		// (65535, 65535*2), we don't send an initial WINDOW_UPDATE
  4184  		// because we only send flow control when the window drops
  4185  		// below half of the maximum. Perhaps it would be nice to
  4186  		// test this case, but we currently do not.
  4187  		65535 * 2,
  4188  	} {
  4189  		synctestSubtest(t, fmt.Sprint(want), func(t *testing.T) {
  4190  
  4191  			st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4192  			}, func(h2 *http.HTTP2Config) {
  4193  				h2.MaxReceiveBufferPerConnection = int(want)
  4194  			})
  4195  			st.writePreface()
  4196  			st.writeSettings()
  4197  			_ = readFrame[*SettingsFrame](t, st)
  4198  			st.writeSettingsAck()
  4199  			st.writeHeaders(HeadersFrameParam{
  4200  				StreamID:      1,
  4201  				BlockFragment: st.encodeHeader(),
  4202  				EndStream:     true,
  4203  				EndHeaders:    true,
  4204  			})
  4205  			window := 65535
  4206  		Frames:
  4207  			for {
  4208  				f := st.readFrame()
  4209  				switch f := f.(type) {
  4210  				case *WindowUpdateFrame:
  4211  					if f.FrameHeader.StreamID != 0 {
  4212  						t.Errorf("WindowUpdate StreamID = %d; want 0", f.FrameHeader.StreamID)
  4213  						return
  4214  					}
  4215  					window += int(f.Increment)
  4216  				case *HeadersFrame:
  4217  					break Frames
  4218  				case nil:
  4219  					break Frames
  4220  				default:
  4221  				}
  4222  			}
  4223  			if window != int(want) {
  4224  				t.Errorf("got initial flow control window = %v, want %v", window, want)
  4225  			}
  4226  		})
  4227  	}
  4228  }
  4229  
  4230  // TestServerWriteDoesNotRetainBufferAfterReturn checks for access to
  4231  // the slice passed to ResponseWriter.Write after Write returns.
  4232  //
  4233  // Terminating the request stream on the client causes Write to return.
  4234  // We should not access the slice after this point.
  4235  func TestServerWriteDoesNotRetainBufferAfterReturn(t *testing.T) {
  4236  	synctest.Test(t, testServerWriteDoesNotRetainBufferAfterReturn)
  4237  }
  4238  func testServerWriteDoesNotRetainBufferAfterReturn(t *testing.T) {
  4239  	donec := make(chan struct{})
  4240  	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  4241  		defer close(donec)
  4242  		buf := make([]byte, 1<<20)
  4243  		var i byte
  4244  		for {
  4245  			i++
  4246  			_, err := w.Write(buf)
  4247  			for j := range buf {
  4248  				buf[j] = byte(i) // trigger race detector
  4249  			}
  4250  			if err != nil {
  4251  				return
  4252  			}
  4253  		}
  4254  	})
  4255  
  4256  	tr := &http.Transport{
  4257  		TLSClientConfig: tlsConfigInsecure,
  4258  		Protocols:       protocols("h2"),
  4259  	}
  4260  	defer tr.CloseIdleConnections()
  4261  
  4262  	req, _ := http.NewRequest("GET", ts.URL, nil)
  4263  	res, err := tr.RoundTrip(req)
  4264  	if err != nil {
  4265  		t.Fatal(err)
  4266  	}
  4267  	res.Body.Close()
  4268  	<-donec
  4269  }
  4270  
  4271  // TestServerWriteDoesNotRetainBufferAfterServerClose checks for access to
  4272  // the slice passed to ResponseWriter.Write after Write returns.
  4273  //
  4274  // Shutting down the Server causes Write to return.
  4275  // We should not access the slice after this point.
  4276  func TestServerWriteDoesNotRetainBufferAfterServerClose(t *testing.T) {
  4277  	synctest.Test(t, testServerWriteDoesNotRetainBufferAfterServerClose)
  4278  }
  4279  func testServerWriteDoesNotRetainBufferAfterServerClose(t *testing.T) {
  4280  	donec := make(chan struct{}, 1)
  4281  	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  4282  		donec <- struct{}{}
  4283  		defer close(donec)
  4284  		buf := make([]byte, 1<<20)
  4285  		var i byte
  4286  		for {
  4287  			i++
  4288  			_, err := w.Write(buf)
  4289  			for j := range buf {
  4290  				buf[j] = byte(i)
  4291  			}
  4292  			if err != nil {
  4293  				return
  4294  			}
  4295  		}
  4296  	})
  4297  
  4298  	tr := &http.Transport{
  4299  		TLSClientConfig: tlsConfigInsecure,
  4300  		Protocols:       protocols("h2"),
  4301  	}
  4302  	defer tr.CloseIdleConnections()
  4303  
  4304  	req, _ := http.NewRequest("GET", ts.URL, nil)
  4305  	res, err := tr.RoundTrip(req)
  4306  	if err != nil {
  4307  		t.Fatal(err)
  4308  	}
  4309  	defer res.Body.Close()
  4310  	<-donec
  4311  	ts.Config.Close()
  4312  	<-donec
  4313  }
  4314  
  4315  func TestServerMaxHandlerGoroutines(t *testing.T) { synctest.Test(t, testServerMaxHandlerGoroutines) }
  4316  func testServerMaxHandlerGoroutines(t *testing.T) {
  4317  	const maxHandlers = 10
  4318  	handlerc := make(chan chan bool)
  4319  	donec := make(chan struct{})
  4320  	defer close(donec)
  4321  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4322  		stopc := make(chan bool, 1)
  4323  		select {
  4324  		case handlerc <- stopc:
  4325  		case <-donec:
  4326  		}
  4327  		select {
  4328  		case shouldPanic := <-stopc:
  4329  			if shouldPanic {
  4330  				panic(http.ErrAbortHandler)
  4331  			}
  4332  		case <-donec:
  4333  		}
  4334  	}, func(h2 *http.HTTP2Config) {
  4335  		h2.MaxConcurrentStreams = maxHandlers
  4336  	})
  4337  	defer st.Close()
  4338  
  4339  	st.greet()
  4340  
  4341  	// Make maxHandlers concurrent requests.
  4342  	// Reset them all, but only after the handler goroutines have started.
  4343  	var stops []chan bool
  4344  	streamID := uint32(1)
  4345  	for range maxHandlers {
  4346  		st.writeHeaders(HeadersFrameParam{
  4347  			StreamID:      streamID,
  4348  			BlockFragment: st.encodeHeader(),
  4349  			EndStream:     true,
  4350  			EndHeaders:    true,
  4351  		})
  4352  		stops = append(stops, <-handlerc)
  4353  		st.fr.WriteRSTStream(streamID, ErrCodeCancel)
  4354  		streamID += 2
  4355  	}
  4356  
  4357  	// Start another request, and immediately reset it.
  4358  	st.writeHeaders(HeadersFrameParam{
  4359  		StreamID:      streamID,
  4360  		BlockFragment: st.encodeHeader(),
  4361  		EndStream:     true,
  4362  		EndHeaders:    true,
  4363  	})
  4364  	st.fr.WriteRSTStream(streamID, ErrCodeCancel)
  4365  	streamID += 2
  4366  
  4367  	// Start another two requests. Don't reset these.
  4368  	for range 2 {
  4369  		st.writeHeaders(HeadersFrameParam{
  4370  			StreamID:      streamID,
  4371  			BlockFragment: st.encodeHeader(),
  4372  			EndStream:     true,
  4373  			EndHeaders:    true,
  4374  		})
  4375  		streamID += 2
  4376  	}
  4377  
  4378  	// The initial maxHandlers handlers are still executing,
  4379  	// so the last two requests don't start any new handlers.
  4380  	select {
  4381  	case <-handlerc:
  4382  		t.Errorf("handler unexpectedly started while maxHandlers are already running")
  4383  	case <-time.After(1 * time.Millisecond):
  4384  	}
  4385  
  4386  	// Tell two handlers to exit.
  4387  	// The pending requests which weren't reset start handlers.
  4388  	stops[0] <- false // normal exit
  4389  	stops[1] <- true  // panic
  4390  	stops = stops[2:]
  4391  	stops = append(stops, <-handlerc)
  4392  	stops = append(stops, <-handlerc)
  4393  
  4394  	// Make a bunch more requests.
  4395  	// Eventually, the server tells us to go away.
  4396  	for range 5 * maxHandlers {
  4397  		st.writeHeaders(HeadersFrameParam{
  4398  			StreamID:      streamID,
  4399  			BlockFragment: st.encodeHeader(),
  4400  			EndStream:     true,
  4401  			EndHeaders:    true,
  4402  		})
  4403  		st.fr.WriteRSTStream(streamID, ErrCodeCancel)
  4404  		streamID += 2
  4405  	}
  4406  	fr := readFrame[*GoAwayFrame](t, st)
  4407  	if fr.ErrCode != ErrCodeEnhanceYourCalm {
  4408  		t.Errorf("err code = %v; want %v", fr.ErrCode, ErrCodeEnhanceYourCalm)
  4409  	}
  4410  
  4411  	for _, s := range stops {
  4412  		close(s)
  4413  	}
  4414  }
  4415  
  4416  func TestServerContinuationFlood(t *testing.T) { synctest.Test(t, testServerContinuationFlood) }
  4417  func testServerContinuationFlood(t *testing.T) {
  4418  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4419  		fmt.Println(r.Header)
  4420  	}, func(s *http.Server) {
  4421  		s.MaxHeaderBytes = 4096
  4422  	})
  4423  	defer st.Close()
  4424  
  4425  	st.greet()
  4426  
  4427  	st.writeHeaders(HeadersFrameParam{
  4428  		StreamID:      1,
  4429  		BlockFragment: st.encodeHeader(),
  4430  		EndStream:     true,
  4431  	})
  4432  	for i := range 1000 {
  4433  		st.fr.WriteContinuation(1, false, st.encodeHeaderRaw(
  4434  			fmt.Sprintf("x-%v", i), "1234567890",
  4435  		))
  4436  	}
  4437  	st.fr.WriteContinuation(1, true, st.encodeHeaderRaw(
  4438  		"x-last-header", "1",
  4439  	))
  4440  
  4441  	for {
  4442  		f := st.readFrame()
  4443  		if f == nil {
  4444  			break
  4445  		}
  4446  		switch f := f.(type) {
  4447  		case *HeadersFrame:
  4448  			t.Fatalf("received HEADERS frame; want GOAWAY and a closed connection")
  4449  		case *GoAwayFrame:
  4450  			// We might not see the GOAWAY (see below), but if we do it should
  4451  			// indicate that the server processed this request so the client doesn't
  4452  			// attempt to retry it.
  4453  			if got, want := f.LastStreamID, uint32(1); got != want {
  4454  				t.Errorf("received GOAWAY with LastStreamId %v, want %v", got, want)
  4455  			}
  4456  
  4457  		}
  4458  	}
  4459  	// We expect to have seen a GOAWAY before the connection closes,
  4460  	// but the server will close the connection after one second
  4461  	// whether or not it has finished sending the GOAWAY. On windows-amd64-race
  4462  	// builders, this fairly consistently results in the connection closing without
  4463  	// the GOAWAY being sent.
  4464  	//
  4465  	// Since the server's behavior is inherently racy here and the important thing
  4466  	// is that the connection is closed, don't check for the GOAWAY having been sent.
  4467  }
  4468  
  4469  func TestServerContinuationAfterInvalidHeader(t *testing.T) {
  4470  	synctest.Test(t, testServerContinuationAfterInvalidHeader)
  4471  }
  4472  func testServerContinuationAfterInvalidHeader(t *testing.T) {
  4473  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4474  		fmt.Println(r.Header)
  4475  	})
  4476  	defer st.Close()
  4477  
  4478  	st.greet()
  4479  
  4480  	st.writeHeaders(HeadersFrameParam{
  4481  		StreamID:      1,
  4482  		BlockFragment: st.encodeHeader(),
  4483  		EndStream:     true,
  4484  	})
  4485  	st.fr.WriteContinuation(1, false, st.encodeHeaderRaw(
  4486  		"x-invalid-header", "\x00",
  4487  	))
  4488  	st.fr.WriteContinuation(1, true, st.encodeHeaderRaw(
  4489  		"x-valid-header", "1",
  4490  	))
  4491  
  4492  	var sawGoAway bool
  4493  	for {
  4494  		f := st.readFrame()
  4495  		if f == nil {
  4496  			break
  4497  		}
  4498  		switch f.(type) {
  4499  		case *GoAwayFrame:
  4500  			sawGoAway = true
  4501  		case *HeadersFrame:
  4502  			t.Fatalf("received HEADERS frame; want GOAWAY")
  4503  		}
  4504  	}
  4505  	if !sawGoAway {
  4506  		t.Errorf("connection closed with no GOAWAY frame; want one")
  4507  	}
  4508  }
  4509  
  4510  // Issue 67036: A stream error should result in the handler's request context being canceled.
  4511  func TestServerRequestCancelOnError(t *testing.T) { synctest.Test(t, testServerRequestCancelOnError) }
  4512  func testServerRequestCancelOnError(t *testing.T) {
  4513  	recvc := make(chan struct{}) // handler has started
  4514  	donec := make(chan struct{}) // handler has finished
  4515  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4516  		close(recvc)
  4517  		<-r.Context().Done()
  4518  		close(donec)
  4519  	})
  4520  	defer st.Close()
  4521  
  4522  	st.greet()
  4523  
  4524  	// Client sends request headers, handler starts.
  4525  	st.writeHeaders(HeadersFrameParam{
  4526  		StreamID:      1,
  4527  		BlockFragment: st.encodeHeader(),
  4528  		EndStream:     true,
  4529  		EndHeaders:    true,
  4530  	})
  4531  	<-recvc
  4532  
  4533  	// Client sends an invalid second set of request headers.
  4534  	// The stream is reset.
  4535  	// The handler's context is canceled, and the handler exits.
  4536  	st.writeHeaders(HeadersFrameParam{
  4537  		StreamID:      1,
  4538  		BlockFragment: st.encodeHeader(),
  4539  		EndStream:     true,
  4540  		EndHeaders:    true,
  4541  	})
  4542  	<-donec
  4543  }
  4544  
  4545  func TestServerSetReadWriteDeadlineRace(t *testing.T) {
  4546  	synctest.Test(t, testServerSetReadWriteDeadlineRace)
  4547  }
  4548  func testServerSetReadWriteDeadlineRace(t *testing.T) {
  4549  	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
  4550  		ctl := http.NewResponseController(w)
  4551  		ctl.SetReadDeadline(time.Now().Add(3600 * time.Second))
  4552  		ctl.SetWriteDeadline(time.Now().Add(3600 * time.Second))
  4553  	})
  4554  	resp, err := ts.Client().Get(ts.URL)
  4555  	if err != nil {
  4556  		t.Fatal(err)
  4557  	}
  4558  	resp.Body.Close()
  4559  }
  4560  
  4561  func TestServerWriteByteTimeout(t *testing.T) { synctest.Test(t, testServerWriteByteTimeout) }
  4562  func testServerWriteByteTimeout(t *testing.T) {
  4563  	const timeout = 1 * time.Second
  4564  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4565  		w.Write(make([]byte, 100))
  4566  	}, func(s *http.Server) {
  4567  		// Use unencrypted HTTP/2, so a byte written by the server corresponds
  4568  		// to a byte read by the test. Using TLS adds another layer of buffering
  4569  		// and timeout management, which aren't really relevant to the test.
  4570  		s.Protocols = protocols("h2c")
  4571  	}, func(h2 *http.HTTP2Config) {
  4572  		h2.WriteByteTimeout = timeout
  4573  	})
  4574  	st.greet()
  4575  
  4576  	st.cc.(*synctestNetConn).SetReadBufferSize(1) // write one byte at a time
  4577  	st.writeHeaders(HeadersFrameParam{
  4578  		StreamID:      1,
  4579  		BlockFragment: st.encodeHeader(),
  4580  		EndStream:     true,
  4581  		EndHeaders:    true,
  4582  	})
  4583  
  4584  	// Read a few bytes, staying just under WriteByteTimeout.
  4585  	for i := range 10 {
  4586  		st.advance(timeout - 1)
  4587  		if n, err := st.cc.Read(make([]byte, 1)); n != 1 || err != nil {
  4588  			t.Fatalf("read %v: %v, %v; want 1, nil", i, n, err)
  4589  		}
  4590  	}
  4591  
  4592  	// Wait for WriteByteTimeout.
  4593  	// The connection should close.
  4594  	st.advance(1 * time.Second) // timeout after writing one byte
  4595  	st.advance(1 * time.Second) // timeout after failing to write any more bytes
  4596  	st.wantClosed()
  4597  }
  4598  
  4599  func TestServerPingSent(t *testing.T) { synctest.Test(t, testServerPingSent) }
  4600  func testServerPingSent(t *testing.T) {
  4601  	const sendPingTimeout = 15 * time.Second
  4602  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4603  	}, func(h2 *http.HTTP2Config) {
  4604  		h2.SendPingTimeout = sendPingTimeout
  4605  	})
  4606  	st.greet()
  4607  
  4608  	st.wantIdle()
  4609  
  4610  	st.advance(sendPingTimeout)
  4611  	_ = readFrame[*PingFrame](t, st)
  4612  	st.wantIdle()
  4613  
  4614  	st.advance(14 * time.Second)
  4615  	st.wantIdle()
  4616  	st.advance(1 * time.Second)
  4617  	st.wantClosed()
  4618  }
  4619  
  4620  func TestServerPingResponded(t *testing.T) { synctest.Test(t, testServerPingResponded) }
  4621  func testServerPingResponded(t *testing.T) {
  4622  	const sendPingTimeout = 15 * time.Second
  4623  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4624  	}, func(h2 *http.HTTP2Config) {
  4625  		h2.SendPingTimeout = sendPingTimeout
  4626  	})
  4627  	st.greet()
  4628  
  4629  	st.wantIdle()
  4630  
  4631  	st.advance(sendPingTimeout)
  4632  	pf := readFrame[*PingFrame](t, st)
  4633  	st.wantIdle()
  4634  
  4635  	st.advance(14 * time.Second)
  4636  	st.wantIdle()
  4637  
  4638  	st.writePing(true, pf.Data)
  4639  
  4640  	st.advance(2 * time.Second)
  4641  	st.wantIdle()
  4642  }
  4643  
  4644  // golang.org/issue/15425: test that a handler closing the request
  4645  // body doesn't terminate the stream to the peer. (It just stops
  4646  // readability from the handler's side, and eventually the client
  4647  // runs out of flow control tokens)
  4648  func TestServerSendDataAfterRequestBodyClose(t *testing.T) {
  4649  	synctest.Test(t, testServerSendDataAfterRequestBodyClose)
  4650  }
  4651  func testServerSendDataAfterRequestBodyClose(t *testing.T) {
  4652  	st := newServerTester(t, nil)
  4653  	st.greet()
  4654  
  4655  	st.writeHeaders(HeadersFrameParam{
  4656  		StreamID:      1,
  4657  		BlockFragment: st.encodeHeader(),
  4658  		EndStream:     false,
  4659  		EndHeaders:    true,
  4660  	})
  4661  
  4662  	// Handler starts writing the response body.
  4663  	call := st.nextHandlerCall()
  4664  	call.do(func(w http.ResponseWriter, req *http.Request) {
  4665  		w.Write([]byte("one"))
  4666  		http.NewResponseController(w).Flush()
  4667  	})
  4668  	st.wantFrameType(FrameHeaders)
  4669  	st.wantData(wantData{
  4670  		streamID:  1,
  4671  		endStream: false,
  4672  		data:      []byte("one"),
  4673  	})
  4674  	st.wantIdle()
  4675  
  4676  	// Handler closes the request body.
  4677  	// This is not observable by the client.
  4678  	call.do(func(w http.ResponseWriter, req *http.Request) {
  4679  		req.Body.Close()
  4680  	})
  4681  	st.wantIdle()
  4682  
  4683  	// The client can still send request data, which is discarded.
  4684  	st.writeData(1, false, []byte("client-sent data"))
  4685  	st.wantIdle()
  4686  
  4687  	// Handler can still write more response body,
  4688  	// which is sent to the client.
  4689  	call.do(func(w http.ResponseWriter, req *http.Request) {
  4690  		w.Write([]byte("two"))
  4691  		http.NewResponseController(w).Flush()
  4692  	})
  4693  	st.wantData(wantData{
  4694  		streamID:  1,
  4695  		endStream: false,
  4696  		data:      []byte("two"),
  4697  	})
  4698  	st.wantIdle()
  4699  }
  4700  
  4701  func TestServerSettingNoRFC7540Priorities(t *testing.T) {
  4702  	synctest.Test(t, testServerSettingNoRFC7540Priorities)
  4703  }
  4704  func testServerSettingNoRFC7540Priorities(t *testing.T) {
  4705  	const wantNoRFC7540Setting = true
  4706  	st := newServerTester(t, nil)
  4707  	defer st.Close()
  4708  
  4709  	var gotNoRFC7540Setting bool
  4710  	st.greetAndCheckSettings(func(s Setting) error {
  4711  		if s.ID != SettingNoRFC7540Priorities {
  4712  			return nil
  4713  		}
  4714  		gotNoRFC7540Setting = s.Val == 1
  4715  		return nil
  4716  	})
  4717  	if wantNoRFC7540Setting != gotNoRFC7540Setting {
  4718  		t.Errorf("want SETTINGS_NO_RFC7540_PRIORITIES to be %v, got %v", wantNoRFC7540Setting, gotNoRFC7540Setting)
  4719  	}
  4720  }
  4721  
  4722  func TestServerSettingNoRFC7540PrioritiesInvalid(t *testing.T) {
  4723  	synctest.Test(t, testServerSettingNoRFC7540PrioritiesInvalid)
  4724  }
  4725  func testServerSettingNoRFC7540PrioritiesInvalid(t *testing.T) {
  4726  	st := newServerTester(t, nil)
  4727  	defer st.Close()
  4728  
  4729  	st.writePreface()
  4730  	st.writeSettings(Setting{ID: SettingNoRFC7540Priorities, Val: 2})
  4731  	synctest.Wait()
  4732  	st.readFrame() // SETTINGS frame
  4733  	st.readFrame() // WINDOW_UPDATE frame
  4734  	st.wantGoAway(0, ErrCodeProtocol)
  4735  }
  4736  
  4737  // This test documents current behavior, rather than ideal behavior that we
  4738  // would necessarily like to see. Refer to go.dev/issues/75936 for details.
  4739  func TestServerRFC9218PrioritySmallPayload(t *testing.T) {
  4740  	synctest.Test(t, testServerRFC9218PrioritySmallPayload)
  4741  }
  4742  func testServerRFC9218PrioritySmallPayload(t *testing.T) {
  4743  	endTest := false
  4744  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4745  		for !endTest {
  4746  			w.Write([]byte("a"))
  4747  			if f, ok := w.(http.Flusher); ok {
  4748  				f.Flush()
  4749  			}
  4750  		}
  4751  	}, func(s *http.Server) {
  4752  		s.Protocols = protocols("h2c")
  4753  	})
  4754  	st.greet()
  4755  	if syncConn, ok := st.cc.(*synctestNetConn); ok {
  4756  		syncConn.SetReadBufferSize(1)
  4757  	} else {
  4758  		t.Fatal("Server connection is not synctestNetConn")
  4759  	}
  4760  	defer st.Close()
  4761  	defer func() { endTest = true }()
  4762  
  4763  	// Create 5 streams with urgency of 0, and another 5 streams with urgency
  4764  	// of 7.
  4765  	// Since each stream receives an infinite number of bytes, we should expect
  4766  	// to see that almost all of the response we get are for the streams with
  4767  	// urgency of 0.
  4768  	for i := 1; i <= 19; i += 2 {
  4769  		urgency := uint8(0)
  4770  		if i > 10 {
  4771  			urgency = 7
  4772  		}
  4773  		st.writeHeaders(HeadersFrameParam{
  4774  			StreamID:      uint32(i),
  4775  			BlockFragment: st.encodeHeader("priority", fmt.Sprintf("u=%d", urgency)),
  4776  			EndStream:     true,
  4777  			EndHeaders:    true,
  4778  		})
  4779  		synctest.Wait()
  4780  	}
  4781  
  4782  	// In the current implementation however, the response we get are
  4783  	// distributed equally amongst all the streams, regardless of weight.
  4784  	streamWriteCount := make(map[uint32]int)
  4785  	totalWriteCount := 10000
  4786  	for range totalWriteCount {
  4787  		f := st.readFrame()
  4788  		if f == nil {
  4789  			break
  4790  		}
  4791  		streamWriteCount[f.Header().StreamID] += 1
  4792  	}
  4793  	for streamID, writeCount := range streamWriteCount {
  4794  		expectedWriteCount := totalWriteCount / len(streamWriteCount)
  4795  		errorMargin := expectedWriteCount / 100
  4796  		if writeCount >= expectedWriteCount+errorMargin || writeCount <= expectedWriteCount-errorMargin {
  4797  			t.Errorf("Expected stream %v to receive %v±%v writes, got %v", streamID, expectedWriteCount, errorMargin, writeCount)
  4798  		}
  4799  	}
  4800  }
  4801  
  4802  func TestServerRFC9218Priority(t *testing.T) {
  4803  	synctest.Test(t, testServerRFC9218Priority)
  4804  }
  4805  func testServerRFC9218Priority(t *testing.T) {
  4806  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4807  		w.Write(slices.Repeat([]byte("a"), 16<<20))
  4808  		if f, ok := w.(http.Flusher); ok {
  4809  			f.Flush()
  4810  		}
  4811  	}, func(s *http.Server) {
  4812  		s.Protocols = protocols("h2c")
  4813  	})
  4814  	defer st.Close()
  4815  	st.greet()
  4816  	if syncConn, ok := st.cc.(*synctestNetConn); ok {
  4817  		syncConn.SetReadBufferSize(1)
  4818  	} else {
  4819  		t.Fatal("Server connection is not synctestNetConn")
  4820  	}
  4821  	st.writeWindowUpdate(0, 1<<30)
  4822  	synctest.Wait()
  4823  
  4824  	// Create 8 streams, where streams with larger ID has lower urgency value
  4825  	// (i.e. more urgent).
  4826  	for i := range 8 {
  4827  		streamID := uint32(i*2 + 1)
  4828  		urgency := 7 - i
  4829  		st.writeHeaders(HeadersFrameParam{
  4830  			StreamID:      streamID,
  4831  			BlockFragment: st.encodeHeader("priority", fmt.Sprintf("u=%d", urgency)),
  4832  			EndStream:     true,
  4833  			EndHeaders:    true,
  4834  		})
  4835  	}
  4836  	synctest.Wait()
  4837  
  4838  	// Keep track of the last frame seen for each stream, indicating that they
  4839  	// are done being processed.
  4840  	lastFrame := make(map[uint32]int)
  4841  	for i := 0; ; i++ {
  4842  		f := st.readFrame()
  4843  		if f == nil {
  4844  			break
  4845  		}
  4846  		lastFrame[f.Header().StreamID] = i
  4847  	}
  4848  	for i := range 7 {
  4849  		streamID := uint32(i*2 + 1)
  4850  		nextStreamID := streamID + 2
  4851  		if lastFrame[streamID] < lastFrame[nextStreamID] {
  4852  			t.Errorf("stream %d finished before stream %d unexpectedly", streamID, nextStreamID)
  4853  		}
  4854  	}
  4855  }
  4856  
  4857  func TestServerRFC9218PriorityIgnoredWhenProxied(t *testing.T) {
  4858  	synctest.Test(t, testServerRFC9218PriorityIgnoredWhenProxied)
  4859  }
  4860  func testServerRFC9218PriorityIgnoredWhenProxied(t *testing.T) {
  4861  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4862  		w.Write(slices.Repeat([]byte("a"), 16<<20))
  4863  		if f, ok := w.(http.Flusher); ok {
  4864  			f.Flush()
  4865  		}
  4866  	}, func(s *http.Server) {
  4867  		s.Protocols = protocols("h2c")
  4868  	})
  4869  	defer st.Close()
  4870  	st.greet()
  4871  	if syncConn, ok := st.cc.(*synctestNetConn); ok {
  4872  		syncConn.SetReadBufferSize(1)
  4873  	} else {
  4874  		t.Fatal("Server connection is not synctestNetConn")
  4875  	}
  4876  	st.writeWindowUpdate(0, 1<<30)
  4877  	synctest.Wait()
  4878  
  4879  	// Create 8 streams, where streams with larger ID has lower urgency value
  4880  	// (i.e. more urgent). These should be ignored since the requests are
  4881  	// coming through a proxy.
  4882  	for i := range 8 {
  4883  		streamID := uint32(i*2 + 1)
  4884  		urgency := 7 - i
  4885  		st.writeHeaders(HeadersFrameParam{
  4886  			StreamID:      streamID,
  4887  			BlockFragment: st.encodeHeader("priority", fmt.Sprintf("u=%d", urgency), "via", "a proxy"),
  4888  			EndStream:     true,
  4889  			EndHeaders:    true,
  4890  		})
  4891  	}
  4892  	synctest.Wait()
  4893  	var streamFrameOrder []uint32
  4894  	for f := st.readFrame(); f != nil; f = st.readFrame() {
  4895  		streamFrameOrder = append(streamFrameOrder, f.Header().StreamID)
  4896  	}
  4897  	// Only check the middle-half of the frame processing order, since the
  4898  	// beginning and end can be not perfectly round-robin (e.g. stream 1 gets
  4899  	// processed a few times while waiting before other streams are opened).
  4900  	half := streamFrameOrder[len(streamFrameOrder)/4 : len(streamFrameOrder)*3/4]
  4901  	if !slices.Equal(slices.Compact(half), half) {
  4902  		t.Errorf("want stream to be processed in round-robin manner when proxied, got: %v", streamFrameOrder)
  4903  	}
  4904  }
  4905  
  4906  func TestServerRFC9218PriorityAware(t *testing.T) {
  4907  	synctest.Test(t, testServerRFC9218PriorityAware)
  4908  }
  4909  func testServerRFC9218PriorityAware(t *testing.T) {
  4910  	st := newServerTester(t, func(w http.ResponseWriter, r *http.Request) {
  4911  		w.Write(slices.Repeat([]byte("a"), 16<<20))
  4912  		if f, ok := w.(http.Flusher); ok {
  4913  			f.Flush()
  4914  		}
  4915  	}, func(s *http.Server) {
  4916  		s.Protocols = protocols("h2c")
  4917  	})
  4918  	defer st.Close()
  4919  	st.greet()
  4920  	if syncConn, ok := st.cc.(*synctestNetConn); ok {
  4921  		syncConn.SetReadBufferSize(1)
  4922  	} else {
  4923  		t.Fatal("Server connection is not synctestNetConn")
  4924  	}
  4925  	st.writeWindowUpdate(0, 1<<30)
  4926  	synctest.Wait()
  4927  
  4928  	// When there is no indication that the client is aware of RFC 9218
  4929  	// priority, it should process streams in a round-robin manner.
  4930  	streamCount := 10
  4931  	for i := range streamCount {
  4932  		streamID := uint32(i*2 + 1)
  4933  		st.writeHeaders(HeadersFrameParam{
  4934  			StreamID:      streamID,
  4935  			BlockFragment: st.encodeHeader(),
  4936  			EndStream:     true,
  4937  			EndHeaders:    true,
  4938  		})
  4939  	}
  4940  	synctest.Wait()
  4941  	var streamFrameOrder []uint32
  4942  	for f := st.readFrame(); f != nil; f = st.readFrame() {
  4943  		streamFrameOrder = append(streamFrameOrder, f.Header().StreamID)
  4944  	}
  4945  	// Only check the middle-half of the frame processing order, since the
  4946  	// beginning and end can be not perfectly round-robin (e.g. stream 1 gets
  4947  	// processed a few times while waiting before other streams are opened).
  4948  	half := streamFrameOrder[len(streamFrameOrder)/4 : len(streamFrameOrder)*3/4]
  4949  	if !slices.Equal(slices.Compact(half), half) {
  4950  		t.Errorf("want stream to be processed in round-robin manner when unaware of priority, got: %v", streamFrameOrder)
  4951  	}
  4952  
  4953  	// Send a PRIORITY_UPDATE frame for stream 1 which would have finished by
  4954  	// now. So, this is a no-op, but makes it so that the server is aware that
  4955  	// the client is aware of RFC 9218 priority.
  4956  	st.writePriorityUpdate(1, "")
  4957  	synctest.Wait()
  4958  
  4959  	// Now that the server knows that the client is aware of RFC 9218 priority,
  4960  	// streams should be processed one-by-one to completion when no explicit
  4961  	// priority is given as they all have the same urgency and are
  4962  	// non-incremental.
  4963  	streamFrameOrder = []uint32{}
  4964  	for i := range streamCount {
  4965  		i += streamCount
  4966  		streamID := uint32(i*2 + 1)
  4967  		st.writeHeaders(HeadersFrameParam{
  4968  			StreamID:      streamID,
  4969  			BlockFragment: st.encodeHeader(),
  4970  			EndStream:     true,
  4971  			EndHeaders:    true,
  4972  		})
  4973  	}
  4974  	for f := st.readFrame(); f != nil; f = st.readFrame() {
  4975  		streamFrameOrder = append(streamFrameOrder, f.Header().StreamID)
  4976  	}
  4977  	if !slices.Equal(slices.Compact(half), half) {
  4978  		t.Errorf("want stream to be processed one-by-one to completion when aware of priority, got: %v", streamFrameOrder)
  4979  	}
  4980  }
  4981  
  4982  func TestServerInvalidPathHeader(t *testing.T) {
  4983  	synctest.Test(t, testServerInvalidPathHeader)
  4984  }
  4985  func testServerInvalidPathHeader(t *testing.T) {
  4986  	for _, path := range []string{
  4987  		"",
  4988  		"\x00",
  4989  		"https://example.com/",
  4990  	} {
  4991  		testServerRejectsStream(t, ErrCodeProtocol, func(st *serverTester) {
  4992  			st.fr.AllowIllegalWrites = true
  4993  			st.writeHeaders(HeadersFrameParam{
  4994  				StreamID: 1,
  4995  				BlockFragment: st.encodeHeader(
  4996  					":path", path,
  4997  				),
  4998  				EndStream:  true,
  4999  				EndHeaders: true,
  5000  			})
  5001  		})
  5002  	}
  5003  }
  5004  
  5005  func TestServerPathInitialSlashes(t *testing.T) {
  5006  	synctest.Test(t, testServerPathInitialSlashes)
  5007  }
  5008  func testServerPathInitialSlashes(t *testing.T) {
  5009  	st := newServerTester(t, nil)
  5010  	st.greet()
  5011  
  5012  	// This path should be passed through unchanged,
  5013  	// and not interpreted as a protocol-relative URL or have initial /s stripped.
  5014  	const path = "//narf.com/path"
  5015  	st.writeHeaders(HeadersFrameParam{
  5016  		StreamID: 1,
  5017  		BlockFragment: st.encodeHeader(
  5018  			":path", path,
  5019  		),
  5020  		EndStream:  true,
  5021  		EndHeaders: true,
  5022  	})
  5023  
  5024  	call := st.nextHandlerCall()
  5025  	if got, want := call.req.URL.Host, ""; got != want {
  5026  		t.Errorf("got req.URL.Host %q, want %q", got, want)
  5027  	}
  5028  	if got, want := call.req.URL.Path, path; got != want {
  5029  		t.Errorf("got req.URL.Path %q, want %q", got, want)
  5030  	}
  5031  }
  5032  
  5033  // "An endpoint MUST treat a change to SETTINGS_INITIAL_WINDOW_SIZE
  5034  // that causes any flow-control window to exceed the maximum size as
  5035  // a connection error (Section 5.4.1) of type FLOW_CONTROL_ERROR."
  5036  // -- https://www.rfc-editor.org/rfc/rfc9113.html#section-6.9.2-7
  5037  func TestServerSettingsFlowControlUpdateBeyondLimit(t *testing.T) {
  5038  	synctest.Test(t, testServerSettingsFlowControlUpdateBeyondLimit)
  5039  }
  5040  func testServerSettingsFlowControlUpdateBeyondLimit(t *testing.T) {
  5041  	st := newServerTester(t, nil)
  5042  	st.greet()
  5043  
  5044  	st.writeHeaders(HeadersFrameParam{
  5045  		StreamID:      1, // clients send odd numbers
  5046  		BlockFragment: st.encodeHeader(":method", "POST"),
  5047  		EndStream:     false, // data coming
  5048  		EndHeaders:    true,
  5049  	})
  5050  
  5051  	// Give this stream some additional flow control.
  5052  	const windowIncrease = 1000
  5053  	st.writeWindowUpdate(1, windowIncrease)
  5054  	st.wantIdle()
  5055  
  5056  	// Adjust the initial flow control window. The stream is now over the limit.
  5057  	const maxWindowSize = (1 << 31) - 1 // RFC 9113, 6.9.1
  5058  	const maxInitialWindowSize = maxWindowSize - windowIncrease
  5059  	st.writeSettings(Setting{SettingInitialWindowSize, maxInitialWindowSize + 1})
  5060  	st.wantGoAway(1, ErrCodeFlowControl)
  5061  }
  5062  
  5063  // Counterpart to TestServerSettingsFlowControlUpdateBeyondLimit:
  5064  // A SETTINGS update which doesn't quite put a stream over the flow control limit.
  5065  func TestServerSettingsFlowControlUpdateWithinLimit(t *testing.T) {
  5066  	synctest.Test(t, testServerSettingsFlowControlUpdateWithinLimit)
  5067  }
  5068  func testServerSettingsFlowControlUpdateWithinLimit(t *testing.T) {
  5069  	st := newServerTester(t, nil)
  5070  	st.greet()
  5071  
  5072  	st.writeHeaders(HeadersFrameParam{
  5073  		StreamID:      1, // clients send odd numbers
  5074  		BlockFragment: st.encodeHeader(":method", "POST"),
  5075  		EndStream:     false, // data coming
  5076  		EndHeaders:    true,
  5077  	})
  5078  
  5079  	// Give this stream some additional flow control.
  5080  	const windowIncrease = 1000
  5081  	st.writeWindowUpdate(1, windowIncrease)
  5082  	st.wantIdle()
  5083  
  5084  	// Adjust the initial flow control window. The stream is just within the limit.
  5085  	const maxWindowSize = (1 << 31) - 1 // RFC 9113, 6.9.1
  5086  	const maxInitialWindowSize = maxWindowSize - windowIncrease
  5087  	st.writeSettings(Setting{SettingInitialWindowSize, maxInitialWindowSize})
  5088  	st.wantSettingsAck()
  5089  	st.wantIdle()
  5090  }
  5091  
  5092  func TestConsistentConstants(t *testing.T) {
  5093  	if h1, h2 := http.DefaultMaxHeaderBytes, http2.DefaultMaxHeaderBytes; h1 != h2 {
  5094  		t.Errorf("DefaultMaxHeaderBytes: http (%v) != http2 (%v)", h1, h2)
  5095  	}
  5096  	if h1, h2 := http.TimeFormat, http2.TimeFormat; h1 != h2 {
  5097  		t.Errorf("TimeFormat: http (%v) != http2 (%v)", h1, h2)
  5098  	}
  5099  }
  5100  
  5101  var (
  5102  	testServerTLSConfig *tls.Config
  5103  	testClientTLSConfig *tls.Config
  5104  )
  5105  
  5106  func init() {
  5107  	cert, err := tls.X509KeyPair(testcert.LocalhostCert, testcert.LocalhostKey)
  5108  	if err != nil {
  5109  		panic(err)
  5110  	}
  5111  	testServerTLSConfig = &tls.Config{
  5112  		Certificates: []tls.Certificate{cert},
  5113  		NextProtos:   []string{"h2"},
  5114  	}
  5115  
  5116  	x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
  5117  	if err != nil {
  5118  		panic(err)
  5119  	}
  5120  	certpool := x509.NewCertPool()
  5121  	certpool.AddCert(x509Cert)
  5122  	testClientTLSConfig = &tls.Config{
  5123  		InsecureSkipVerify: true,
  5124  		RootCAs:            certpool,
  5125  		NextProtos:         []string{"h2"},
  5126  	}
  5127  }
  5128  
  5129  func protocols(protos ...string) *http.Protocols {
  5130  	p := new(http.Protocols)
  5131  	for _, s := range protos {
  5132  		switch s {
  5133  		case "h1":
  5134  			p.SetHTTP1(true)
  5135  		case "h2":
  5136  			p.SetHTTP2(true)
  5137  		case "h2c":
  5138  			p.SetUnencryptedHTTP2(true)
  5139  		default:
  5140  			panic("unknown protocol: " + s)
  5141  		}
  5142  	}
  5143  	return p
  5144  }
  5145  
  5146  //go:linkname transportFromH1Transport
  5147  func transportFromH1Transport(tr *http.Transport) any
  5148  

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