Source file src/net/http/clientserver_test.go

     1  // Copyright 2015 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  // Tests that use both the client & server, in both HTTP/1 and HTTP/2 mode.
     6  
     7  package http_test
     8  
     9  import (
    10  	"bytes"
    11  	"compress/gzip"
    12  	"context"
    13  	"crypto/rand"
    14  	"crypto/sha1"
    15  	"crypto/tls"
    16  	"fmt"
    17  	"hash"
    18  	"io"
    19  	"log"
    20  	"net"
    21  	. "net/http"
    22  	"net/http/httptest"
    23  	"net/http/httptrace"
    24  	"net/http/httputil"
    25  	"net/textproto"
    26  	"net/url"
    27  	"os"
    28  	"reflect"
    29  	"runtime"
    30  	"sort"
    31  	"strings"
    32  	"sync"
    33  	"sync/atomic"
    34  	"testing"
    35  	"time"
    36  )
    37  
    38  type testMode string
    39  
    40  const (
    41  	http1Mode  = testMode("h1")     // HTTP/1.1
    42  	https1Mode = testMode("https1") // HTTPS/1.1
    43  	http2Mode  = testMode("h2")     // HTTP/2
    44  )
    45  
    46  type testNotParallelOpt struct{}
    47  
    48  var (
    49  	testNotParallel = testNotParallelOpt{}
    50  )
    51  
    52  type TBRun[T any] interface {
    53  	testing.TB
    54  	Run(string, func(T)) bool
    55  }
    56  
    57  // run runs a client/server test in a variety of test configurations.
    58  //
    59  // Tests execute in HTTP/1.1 and HTTP/2 modes by default.
    60  // To run in a different set of configurations, pass a []testMode option.
    61  //
    62  // Tests call t.Parallel() by default.
    63  // To disable parallel execution, pass the testNotParallel option.
    64  func run[T TBRun[T]](t T, f func(t T, mode testMode), opts ...any) {
    65  	t.Helper()
    66  	modes := []testMode{http1Mode, http2Mode}
    67  	parallel := true
    68  	for _, opt := range opts {
    69  		switch opt := opt.(type) {
    70  		case []testMode:
    71  			modes = opt
    72  		case testNotParallelOpt:
    73  			parallel = false
    74  		default:
    75  			t.Fatalf("unknown option type %T", opt)
    76  		}
    77  	}
    78  	if t, ok := any(t).(*testing.T); ok && parallel {
    79  		setParallel(t)
    80  	}
    81  	for _, mode := range modes {
    82  		t.Run(string(mode), func(t T) {
    83  			t.Helper()
    84  			if t, ok := any(t).(*testing.T); ok && parallel {
    85  				setParallel(t)
    86  			}
    87  			t.Cleanup(func() {
    88  				afterTest(t)
    89  			})
    90  			f(t, mode)
    91  		})
    92  	}
    93  }
    94  
    95  type clientServerTest struct {
    96  	t  testing.TB
    97  	h2 bool
    98  	h  Handler
    99  	ts *httptest.Server
   100  	tr *Transport
   101  	c  *Client
   102  }
   103  
   104  func (t *clientServerTest) close() {
   105  	t.tr.CloseIdleConnections()
   106  	t.ts.Close()
   107  }
   108  
   109  func (t *clientServerTest) getURL(u string) string {
   110  	res, err := t.c.Get(u)
   111  	if err != nil {
   112  		t.t.Fatal(err)
   113  	}
   114  	defer res.Body.Close()
   115  	slurp, err := io.ReadAll(res.Body)
   116  	if err != nil {
   117  		t.t.Fatal(err)
   118  	}
   119  	return string(slurp)
   120  }
   121  
   122  func (t *clientServerTest) scheme() string {
   123  	if t.h2 {
   124  		return "https"
   125  	}
   126  	return "http"
   127  }
   128  
   129  var optQuietLog = func(ts *httptest.Server) {
   130  	ts.Config.ErrorLog = quietLog
   131  }
   132  
   133  func optWithServerLog(lg *log.Logger) func(*httptest.Server) {
   134  	return func(ts *httptest.Server) {
   135  		ts.Config.ErrorLog = lg
   136  	}
   137  }
   138  
   139  // newClientServerTest creates and starts an httptest.Server.
   140  //
   141  // The mode parameter selects the implementation to test:
   142  // HTTP/1, HTTP/2, etc. Tests using newClientServerTest should use
   143  // the 'run' function, which will start a subtests for each tested mode.
   144  //
   145  // The vararg opts parameter can include functions to configure the
   146  // test server or transport.
   147  //
   148  //	func(*httptest.Server) // run before starting the server
   149  //	func(*http.Transport)
   150  func newClientServerTest(t testing.TB, mode testMode, h Handler, opts ...any) *clientServerTest {
   151  	if mode == http2Mode {
   152  		CondSkipHTTP2(t)
   153  	}
   154  	cst := &clientServerTest{
   155  		t:  t,
   156  		h2: mode == http2Mode,
   157  		h:  h,
   158  	}
   159  	cst.ts = httptest.NewUnstartedServer(h)
   160  
   161  	var transportFuncs []func(*Transport)
   162  	for _, opt := range opts {
   163  		switch opt := opt.(type) {
   164  		case func(*Transport):
   165  			transportFuncs = append(transportFuncs, opt)
   166  		case func(*httptest.Server):
   167  			opt(cst.ts)
   168  		default:
   169  			t.Fatalf("unhandled option type %T", opt)
   170  		}
   171  	}
   172  
   173  	if cst.ts.Config.ErrorLog == nil {
   174  		cst.ts.Config.ErrorLog = log.New(testLogWriter{t}, "", 0)
   175  	}
   176  
   177  	switch mode {
   178  	case http1Mode:
   179  		cst.ts.Start()
   180  	case https1Mode:
   181  		cst.ts.StartTLS()
   182  	case http2Mode:
   183  		ExportHttp2ConfigureServer(cst.ts.Config, nil)
   184  		cst.ts.TLS = cst.ts.Config.TLSConfig
   185  		cst.ts.StartTLS()
   186  	default:
   187  		t.Fatalf("unknown test mode %v", mode)
   188  	}
   189  	cst.c = cst.ts.Client()
   190  	cst.tr = cst.c.Transport.(*Transport)
   191  	if mode == http2Mode {
   192  		if err := ExportHttp2ConfigureTransport(cst.tr); err != nil {
   193  			t.Fatal(err)
   194  		}
   195  	}
   196  	for _, f := range transportFuncs {
   197  		f(cst.tr)
   198  	}
   199  	t.Cleanup(func() {
   200  		cst.close()
   201  	})
   202  	return cst
   203  }
   204  
   205  type testLogWriter struct {
   206  	t testing.TB
   207  }
   208  
   209  func (w testLogWriter) Write(b []byte) (int, error) {
   210  	w.t.Logf("server log: %v", strings.TrimSpace(string(b)))
   211  	return len(b), nil
   212  }
   213  
   214  // Testing the newClientServerTest helper itself.
   215  func TestNewClientServerTest(t *testing.T) {
   216  	run(t, testNewClientServerTest, []testMode{http1Mode, https1Mode, http2Mode})
   217  }
   218  func testNewClientServerTest(t *testing.T, mode testMode) {
   219  	var got struct {
   220  		sync.Mutex
   221  		proto  string
   222  		hasTLS bool
   223  	}
   224  	h := HandlerFunc(func(w ResponseWriter, r *Request) {
   225  		got.Lock()
   226  		defer got.Unlock()
   227  		got.proto = r.Proto
   228  		got.hasTLS = r.TLS != nil
   229  	})
   230  	cst := newClientServerTest(t, mode, h)
   231  	if _, err := cst.c.Head(cst.ts.URL); err != nil {
   232  		t.Fatal(err)
   233  	}
   234  	var wantProto string
   235  	var wantTLS bool
   236  	switch mode {
   237  	case http1Mode:
   238  		wantProto = "HTTP/1.1"
   239  		wantTLS = false
   240  	case https1Mode:
   241  		wantProto = "HTTP/1.1"
   242  		wantTLS = true
   243  	case http2Mode:
   244  		wantProto = "HTTP/2.0"
   245  		wantTLS = true
   246  	}
   247  	if got.proto != wantProto {
   248  		t.Errorf("req.Proto = %q, want %q", got.proto, wantProto)
   249  	}
   250  	if got.hasTLS != wantTLS {
   251  		t.Errorf("req.TLS set: %v, want %v", got.hasTLS, wantTLS)
   252  	}
   253  }
   254  
   255  func TestChunkedResponseHeaders(t *testing.T) { run(t, testChunkedResponseHeaders) }
   256  func testChunkedResponseHeaders(t *testing.T, mode testMode) {
   257  	log.SetOutput(io.Discard) // is noisy otherwise
   258  	defer log.SetOutput(os.Stderr)
   259  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   260  		w.Header().Set("Content-Length", "intentional gibberish") // we check that this is deleted
   261  		w.(Flusher).Flush()
   262  		fmt.Fprintf(w, "I am a chunked response.")
   263  	}))
   264  
   265  	res, err := cst.c.Get(cst.ts.URL)
   266  	if err != nil {
   267  		t.Fatalf("Get error: %v", err)
   268  	}
   269  	defer res.Body.Close()
   270  	if g, e := res.ContentLength, int64(-1); g != e {
   271  		t.Errorf("expected ContentLength of %d; got %d", e, g)
   272  	}
   273  	wantTE := []string{"chunked"}
   274  	if mode == http2Mode {
   275  		wantTE = nil
   276  	}
   277  	if !reflect.DeepEqual(res.TransferEncoding, wantTE) {
   278  		t.Errorf("TransferEncoding = %v; want %v", res.TransferEncoding, wantTE)
   279  	}
   280  	if got, haveCL := res.Header["Content-Length"]; haveCL {
   281  		t.Errorf("Unexpected Content-Length: %q", got)
   282  	}
   283  }
   284  
   285  type reqFunc func(c *Client, url string) (*Response, error)
   286  
   287  // h12Compare is a test that compares HTTP/1 and HTTP/2 behavior
   288  // against each other.
   289  type h12Compare struct {
   290  	Handler            func(ResponseWriter, *Request)    // required
   291  	ReqFunc            reqFunc                           // optional
   292  	CheckResponse      func(proto string, res *Response) // optional
   293  	EarlyCheckResponse func(proto string, res *Response) // optional; pre-normalize
   294  	Opts               []any
   295  }
   296  
   297  func (tt h12Compare) reqFunc() reqFunc {
   298  	if tt.ReqFunc == nil {
   299  		return (*Client).Get
   300  	}
   301  	return tt.ReqFunc
   302  }
   303  
   304  func (tt h12Compare) run(t *testing.T) {
   305  	setParallel(t)
   306  	cst1 := newClientServerTest(t, http1Mode, HandlerFunc(tt.Handler), tt.Opts...)
   307  	defer cst1.close()
   308  	cst2 := newClientServerTest(t, http2Mode, HandlerFunc(tt.Handler), tt.Opts...)
   309  	defer cst2.close()
   310  
   311  	res1, err := tt.reqFunc()(cst1.c, cst1.ts.URL)
   312  	if err != nil {
   313  		t.Errorf("HTTP/1 request: %v", err)
   314  		return
   315  	}
   316  	res2, err := tt.reqFunc()(cst2.c, cst2.ts.URL)
   317  	if err != nil {
   318  		t.Errorf("HTTP/2 request: %v", err)
   319  		return
   320  	}
   321  
   322  	if fn := tt.EarlyCheckResponse; fn != nil {
   323  		fn("HTTP/1.1", res1)
   324  		fn("HTTP/2.0", res2)
   325  	}
   326  
   327  	tt.normalizeRes(t, res1, "HTTP/1.1")
   328  	tt.normalizeRes(t, res2, "HTTP/2.0")
   329  	res1body, res2body := res1.Body, res2.Body
   330  
   331  	eres1 := mostlyCopy(res1)
   332  	eres2 := mostlyCopy(res2)
   333  	if !reflect.DeepEqual(eres1, eres2) {
   334  		t.Errorf("Response headers to handler differed:\nhttp/1 (%v):\n\t%#v\nhttp/2 (%v):\n\t%#v",
   335  			cst1.ts.URL, eres1, cst2.ts.URL, eres2)
   336  	}
   337  	if !reflect.DeepEqual(res1body, res2body) {
   338  		t.Errorf("Response bodies to handler differed.\nhttp1: %v\nhttp2: %v\n", res1body, res2body)
   339  	}
   340  	if fn := tt.CheckResponse; fn != nil {
   341  		res1.Body, res2.Body = res1body, res2body
   342  		fn("HTTP/1.1", res1)
   343  		fn("HTTP/2.0", res2)
   344  	}
   345  }
   346  
   347  func mostlyCopy(r *Response) *Response {
   348  	c := *r
   349  	c.Body = nil
   350  	c.TransferEncoding = nil
   351  	c.TLS = nil
   352  	c.Request = nil
   353  	return &c
   354  }
   355  
   356  type slurpResult struct {
   357  	io.ReadCloser
   358  	body []byte
   359  	err  error
   360  }
   361  
   362  func (sr slurpResult) String() string { return fmt.Sprintf("body %q; err %v", sr.body, sr.err) }
   363  
   364  func (tt h12Compare) normalizeRes(t *testing.T, res *Response, wantProto string) {
   365  	if res.Proto == wantProto || res.Proto == "HTTP/IGNORE" {
   366  		res.Proto, res.ProtoMajor, res.ProtoMinor = "", 0, 0
   367  	} else {
   368  		t.Errorf("got %q response; want %q", res.Proto, wantProto)
   369  	}
   370  	slurp, err := io.ReadAll(res.Body)
   371  
   372  	res.Body.Close()
   373  	res.Body = slurpResult{
   374  		ReadCloser: io.NopCloser(bytes.NewReader(slurp)),
   375  		body:       slurp,
   376  		err:        err,
   377  	}
   378  	for i, v := range res.Header["Date"] {
   379  		res.Header["Date"][i] = strings.Repeat("x", len(v))
   380  	}
   381  	if res.Request == nil {
   382  		t.Errorf("for %s, no request", wantProto)
   383  	}
   384  	if (res.TLS != nil) != (wantProto == "HTTP/2.0") {
   385  		t.Errorf("TLS set = %v; want %v", res.TLS != nil, res.TLS == nil)
   386  	}
   387  }
   388  
   389  // Issue 13532
   390  func TestH12_HeadContentLengthNoBody(t *testing.T) {
   391  	h12Compare{
   392  		ReqFunc: (*Client).Head,
   393  		Handler: func(w ResponseWriter, r *Request) {
   394  		},
   395  	}.run(t)
   396  }
   397  
   398  func TestH12_HeadContentLengthSmallBody(t *testing.T) {
   399  	h12Compare{
   400  		ReqFunc: (*Client).Head,
   401  		Handler: func(w ResponseWriter, r *Request) {
   402  			io.WriteString(w, "small")
   403  		},
   404  	}.run(t)
   405  }
   406  
   407  func TestH12_HeadContentLengthLargeBody(t *testing.T) {
   408  	h12Compare{
   409  		ReqFunc: (*Client).Head,
   410  		Handler: func(w ResponseWriter, r *Request) {
   411  			chunk := strings.Repeat("x", 512<<10)
   412  			for i := 0; i < 10; i++ {
   413  				io.WriteString(w, chunk)
   414  			}
   415  		},
   416  	}.run(t)
   417  }
   418  
   419  func TestH12_200NoBody(t *testing.T) {
   420  	h12Compare{Handler: func(w ResponseWriter, r *Request) {}}.run(t)
   421  }
   422  
   423  func TestH2_204NoBody(t *testing.T) { testH12_noBody(t, 204) }
   424  func TestH2_304NoBody(t *testing.T) { testH12_noBody(t, 304) }
   425  func TestH2_404NoBody(t *testing.T) { testH12_noBody(t, 404) }
   426  
   427  func testH12_noBody(t *testing.T, status int) {
   428  	h12Compare{Handler: func(w ResponseWriter, r *Request) {
   429  		w.WriteHeader(status)
   430  	}}.run(t)
   431  }
   432  
   433  func TestH12_SmallBody(t *testing.T) {
   434  	h12Compare{Handler: func(w ResponseWriter, r *Request) {
   435  		io.WriteString(w, "small body")
   436  	}}.run(t)
   437  }
   438  
   439  func TestH12_ExplicitContentLength(t *testing.T) {
   440  	h12Compare{Handler: func(w ResponseWriter, r *Request) {
   441  		w.Header().Set("Content-Length", "3")
   442  		io.WriteString(w, "foo")
   443  	}}.run(t)
   444  }
   445  
   446  func TestH12_FlushBeforeBody(t *testing.T) {
   447  	h12Compare{Handler: func(w ResponseWriter, r *Request) {
   448  		w.(Flusher).Flush()
   449  		io.WriteString(w, "foo")
   450  	}}.run(t)
   451  }
   452  
   453  func TestH12_FlushMidBody(t *testing.T) {
   454  	h12Compare{Handler: func(w ResponseWriter, r *Request) {
   455  		io.WriteString(w, "foo")
   456  		w.(Flusher).Flush()
   457  		io.WriteString(w, "bar")
   458  	}}.run(t)
   459  }
   460  
   461  func TestH12_Head_ExplicitLen(t *testing.T) {
   462  	h12Compare{
   463  		ReqFunc: (*Client).Head,
   464  		Handler: func(w ResponseWriter, r *Request) {
   465  			if r.Method != "HEAD" {
   466  				t.Errorf("unexpected method %q", r.Method)
   467  			}
   468  			w.Header().Set("Content-Length", "1235")
   469  		},
   470  	}.run(t)
   471  }
   472  
   473  func TestH12_Head_ImplicitLen(t *testing.T) {
   474  	h12Compare{
   475  		ReqFunc: (*Client).Head,
   476  		Handler: func(w ResponseWriter, r *Request) {
   477  			if r.Method != "HEAD" {
   478  				t.Errorf("unexpected method %q", r.Method)
   479  			}
   480  			io.WriteString(w, "foo")
   481  		},
   482  	}.run(t)
   483  }
   484  
   485  func TestH12_HandlerWritesTooLittle(t *testing.T) {
   486  	h12Compare{
   487  		Handler: func(w ResponseWriter, r *Request) {
   488  			w.Header().Set("Content-Length", "3")
   489  			io.WriteString(w, "12") // one byte short
   490  		},
   491  		CheckResponse: func(proto string, res *Response) {
   492  			sr, ok := res.Body.(slurpResult)
   493  			if !ok {
   494  				t.Errorf("%s body is %T; want slurpResult", proto, res.Body)
   495  				return
   496  			}
   497  			if sr.err != io.ErrUnexpectedEOF {
   498  				t.Errorf("%s read error = %v; want io.ErrUnexpectedEOF", proto, sr.err)
   499  			}
   500  			if string(sr.body) != "12" {
   501  				t.Errorf("%s body = %q; want %q", proto, sr.body, "12")
   502  			}
   503  		},
   504  	}.run(t)
   505  }
   506  
   507  // Tests that the HTTP/1 and HTTP/2 servers prevent handlers from
   508  // writing more than they declared. This test does not test whether
   509  // the transport deals with too much data, though, since the server
   510  // doesn't make it possible to send bogus data. For those tests, see
   511  // transport_test.go (for HTTP/1) or x/net/http2/transport_test.go
   512  // (for HTTP/2).
   513  func TestH12_HandlerWritesTooMuch(t *testing.T) {
   514  	h12Compare{
   515  		Handler: func(w ResponseWriter, r *Request) {
   516  			w.Header().Set("Content-Length", "3")
   517  			w.(Flusher).Flush()
   518  			io.WriteString(w, "123")
   519  			w.(Flusher).Flush()
   520  			n, err := io.WriteString(w, "x") // too many
   521  			if n > 0 || err == nil {
   522  				t.Errorf("for proto %q, final write = %v, %v; want 0, some error", r.Proto, n, err)
   523  			}
   524  		},
   525  	}.run(t)
   526  }
   527  
   528  // Verify that both our HTTP/1 and HTTP/2 request and auto-decompress gzip.
   529  // Some hosts send gzip even if you don't ask for it; see golang.org/issue/13298
   530  func TestH12_AutoGzip(t *testing.T) {
   531  	h12Compare{
   532  		Handler: func(w ResponseWriter, r *Request) {
   533  			if ae := r.Header.Get("Accept-Encoding"); ae != "gzip" {
   534  				t.Errorf("%s Accept-Encoding = %q; want gzip", r.Proto, ae)
   535  			}
   536  			w.Header().Set("Content-Encoding", "gzip")
   537  			gz := gzip.NewWriter(w)
   538  			io.WriteString(gz, "I am some gzipped content. Go go go go go go go go go go go go should compress well.")
   539  			gz.Close()
   540  		},
   541  	}.run(t)
   542  }
   543  
   544  func TestH12_AutoGzip_Disabled(t *testing.T) {
   545  	h12Compare{
   546  		Opts: []any{
   547  			func(tr *Transport) { tr.DisableCompression = true },
   548  		},
   549  		Handler: func(w ResponseWriter, r *Request) {
   550  			fmt.Fprintf(w, "%q", r.Header["Accept-Encoding"])
   551  			if ae := r.Header.Get("Accept-Encoding"); ae != "" {
   552  				t.Errorf("%s Accept-Encoding = %q; want empty", r.Proto, ae)
   553  			}
   554  		},
   555  	}.run(t)
   556  }
   557  
   558  // Test304Responses verifies that 304s don't declare that they're
   559  // chunking in their response headers and aren't allowed to produce
   560  // output.
   561  func Test304Responses(t *testing.T) { run(t, test304Responses) }
   562  func test304Responses(t *testing.T, mode testMode) {
   563  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   564  		w.WriteHeader(StatusNotModified)
   565  		_, err := w.Write([]byte("illegal body"))
   566  		if err != ErrBodyNotAllowed {
   567  			t.Errorf("on Write, expected ErrBodyNotAllowed, got %v", err)
   568  		}
   569  	}))
   570  	defer cst.close()
   571  	res, err := cst.c.Get(cst.ts.URL)
   572  	if err != nil {
   573  		t.Fatal(err)
   574  	}
   575  	if len(res.TransferEncoding) > 0 {
   576  		t.Errorf("expected no TransferEncoding; got %v", res.TransferEncoding)
   577  	}
   578  	body, err := io.ReadAll(res.Body)
   579  	if err != nil {
   580  		t.Error(err)
   581  	}
   582  	if len(body) > 0 {
   583  		t.Errorf("got unexpected body %q", string(body))
   584  	}
   585  }
   586  
   587  func TestH12_ServerEmptyContentLength(t *testing.T) {
   588  	h12Compare{
   589  		Handler: func(w ResponseWriter, r *Request) {
   590  			w.Header()["Content-Type"] = []string{""}
   591  			io.WriteString(w, "<html><body>hi</body></html>")
   592  		},
   593  	}.run(t)
   594  }
   595  
   596  func TestH12_RequestContentLength_Known_NonZero(t *testing.T) {
   597  	h12requestContentLength(t, func() io.Reader { return strings.NewReader("FOUR") }, 4)
   598  }
   599  
   600  func TestH12_RequestContentLength_Known_Zero(t *testing.T) {
   601  	h12requestContentLength(t, func() io.Reader { return nil }, 0)
   602  }
   603  
   604  func TestH12_RequestContentLength_Unknown(t *testing.T) {
   605  	h12requestContentLength(t, func() io.Reader { return struct{ io.Reader }{strings.NewReader("Stuff")} }, -1)
   606  }
   607  
   608  func h12requestContentLength(t *testing.T, bodyfn func() io.Reader, wantLen int64) {
   609  	h12Compare{
   610  		Handler: func(w ResponseWriter, r *Request) {
   611  			w.Header().Set("Got-Length", fmt.Sprint(r.ContentLength))
   612  			fmt.Fprintf(w, "Req.ContentLength=%v", r.ContentLength)
   613  		},
   614  		ReqFunc: func(c *Client, url string) (*Response, error) {
   615  			return c.Post(url, "text/plain", bodyfn())
   616  		},
   617  		CheckResponse: func(proto string, res *Response) {
   618  			if got, want := res.Header.Get("Got-Length"), fmt.Sprint(wantLen); got != want {
   619  				t.Errorf("Proto %q got length %q; want %q", proto, got, want)
   620  			}
   621  		},
   622  	}.run(t)
   623  }
   624  
   625  // Tests that closing the Request.Cancel channel also while still
   626  // reading the response body. Issue 13159.
   627  func TestCancelRequestMidBody(t *testing.T) { run(t, testCancelRequestMidBody) }
   628  func testCancelRequestMidBody(t *testing.T, mode testMode) {
   629  	unblock := make(chan bool)
   630  	didFlush := make(chan bool, 1)
   631  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   632  		io.WriteString(w, "Hello")
   633  		w.(Flusher).Flush()
   634  		didFlush <- true
   635  		<-unblock
   636  		io.WriteString(w, ", world.")
   637  	}))
   638  	defer close(unblock)
   639  
   640  	req, _ := NewRequest("GET", cst.ts.URL, nil)
   641  	cancel := make(chan struct{})
   642  	req.Cancel = cancel
   643  
   644  	res, err := cst.c.Do(req)
   645  	if err != nil {
   646  		t.Fatal(err)
   647  	}
   648  	defer res.Body.Close()
   649  	<-didFlush
   650  
   651  	// Read a bit before we cancel. (Issue 13626)
   652  	// We should have "Hello" at least sitting there.
   653  	firstRead := make([]byte, 10)
   654  	n, err := res.Body.Read(firstRead)
   655  	if err != nil {
   656  		t.Fatal(err)
   657  	}
   658  	firstRead = firstRead[:n]
   659  
   660  	close(cancel)
   661  
   662  	rest, err := io.ReadAll(res.Body)
   663  	all := string(firstRead) + string(rest)
   664  	if all != "Hello" {
   665  		t.Errorf("Read %q (%q + %q); want Hello", all, firstRead, rest)
   666  	}
   667  	if err != ExportErrRequestCanceled {
   668  		t.Errorf("ReadAll error = %v; want %v", err, ExportErrRequestCanceled)
   669  	}
   670  }
   671  
   672  // Tests that clients can send trailers to a server and that the server can read them.
   673  func TestTrailersClientToServer(t *testing.T) { run(t, testTrailersClientToServer) }
   674  func testTrailersClientToServer(t *testing.T, mode testMode) {
   675  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   676  		var decl []string
   677  		for k := range r.Trailer {
   678  			decl = append(decl, k)
   679  		}
   680  		sort.Strings(decl)
   681  
   682  		slurp, err := io.ReadAll(r.Body)
   683  		if err != nil {
   684  			t.Errorf("Server reading request body: %v", err)
   685  		}
   686  		if string(slurp) != "foo" {
   687  			t.Errorf("Server read request body %q; want foo", slurp)
   688  		}
   689  		if r.Trailer == nil {
   690  			io.WriteString(w, "nil Trailer")
   691  		} else {
   692  			fmt.Fprintf(w, "decl: %v, vals: %s, %s",
   693  				decl,
   694  				r.Trailer.Get("Client-Trailer-A"),
   695  				r.Trailer.Get("Client-Trailer-B"))
   696  		}
   697  	}))
   698  
   699  	var req *Request
   700  	req, _ = NewRequest("POST", cst.ts.URL, io.MultiReader(
   701  		eofReaderFunc(func() {
   702  			req.Trailer["Client-Trailer-A"] = []string{"valuea"}
   703  		}),
   704  		strings.NewReader("foo"),
   705  		eofReaderFunc(func() {
   706  			req.Trailer["Client-Trailer-B"] = []string{"valueb"}
   707  		}),
   708  	))
   709  	req.Trailer = Header{
   710  		"Client-Trailer-A": nil, //  to be set later
   711  		"Client-Trailer-B": nil, //  to be set later
   712  	}
   713  	req.ContentLength = -1
   714  	res, err := cst.c.Do(req)
   715  	if err != nil {
   716  		t.Fatal(err)
   717  	}
   718  	if err := wantBody(res, err, "decl: [Client-Trailer-A Client-Trailer-B], vals: valuea, valueb"); err != nil {
   719  		t.Error(err)
   720  	}
   721  }
   722  
   723  // Tests that servers send trailers to a client and that the client can read them.
   724  func TestTrailersServerToClient(t *testing.T) {
   725  	run(t, func(t *testing.T, mode testMode) {
   726  		testTrailersServerToClient(t, mode, false)
   727  	})
   728  }
   729  func TestTrailersServerToClientFlush(t *testing.T) {
   730  	run(t, func(t *testing.T, mode testMode) {
   731  		testTrailersServerToClient(t, mode, true)
   732  	})
   733  }
   734  
   735  func testTrailersServerToClient(t *testing.T, mode testMode, flush bool) {
   736  	const body = "Some body"
   737  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   738  		w.Header().Set("Trailer", "Server-Trailer-A, Server-Trailer-B")
   739  		w.Header().Add("Trailer", "Server-Trailer-C")
   740  
   741  		io.WriteString(w, body)
   742  		if flush {
   743  			w.(Flusher).Flush()
   744  		}
   745  
   746  		// How handlers set Trailers: declare it ahead of time
   747  		// with the Trailer header, and then mutate the
   748  		// Header() of those values later, after the response
   749  		// has been written (we wrote to w above).
   750  		w.Header().Set("Server-Trailer-A", "valuea")
   751  		w.Header().Set("Server-Trailer-C", "valuec") // skipping B
   752  		w.Header().Set("Server-Trailer-NotDeclared", "should be omitted")
   753  	}))
   754  
   755  	res, err := cst.c.Get(cst.ts.URL)
   756  	if err != nil {
   757  		t.Fatal(err)
   758  	}
   759  
   760  	wantHeader := Header{
   761  		"Content-Type": {"text/plain; charset=utf-8"},
   762  	}
   763  	wantLen := -1
   764  	if mode == http2Mode && !flush {
   765  		// In HTTP/1.1, any use of trailers forces HTTP/1.1
   766  		// chunking and a flush at the first write. That's
   767  		// unnecessary with HTTP/2's framing, so the server
   768  		// is able to calculate the length while still sending
   769  		// trailers afterwards.
   770  		wantLen = len(body)
   771  		wantHeader["Content-Length"] = []string{fmt.Sprint(wantLen)}
   772  	}
   773  	if res.ContentLength != int64(wantLen) {
   774  		t.Errorf("ContentLength = %v; want %v", res.ContentLength, wantLen)
   775  	}
   776  
   777  	delete(res.Header, "Date") // irrelevant for test
   778  	if !reflect.DeepEqual(res.Header, wantHeader) {
   779  		t.Errorf("Header = %v; want %v", res.Header, wantHeader)
   780  	}
   781  
   782  	if got, want := res.Trailer, (Header{
   783  		"Server-Trailer-A": nil,
   784  		"Server-Trailer-B": nil,
   785  		"Server-Trailer-C": nil,
   786  	}); !reflect.DeepEqual(got, want) {
   787  		t.Errorf("Trailer before body read = %v; want %v", got, want)
   788  	}
   789  
   790  	if err := wantBody(res, nil, body); err != nil {
   791  		t.Fatal(err)
   792  	}
   793  
   794  	if got, want := res.Trailer, (Header{
   795  		"Server-Trailer-A": {"valuea"},
   796  		"Server-Trailer-B": nil,
   797  		"Server-Trailer-C": {"valuec"},
   798  	}); !reflect.DeepEqual(got, want) {
   799  		t.Errorf("Trailer after body read = %v; want %v", got, want)
   800  	}
   801  }
   802  
   803  // Don't allow a Body.Read after Body.Close. Issue 13648.
   804  func TestResponseBodyReadAfterClose(t *testing.T) { run(t, testResponseBodyReadAfterClose) }
   805  func testResponseBodyReadAfterClose(t *testing.T, mode testMode) {
   806  	const body = "Some body"
   807  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   808  		io.WriteString(w, body)
   809  	}))
   810  	res, err := cst.c.Get(cst.ts.URL)
   811  	if err != nil {
   812  		t.Fatal(err)
   813  	}
   814  	res.Body.Close()
   815  	data, err := io.ReadAll(res.Body)
   816  	if len(data) != 0 || err == nil {
   817  		t.Fatalf("ReadAll returned %q, %v; want error", data, err)
   818  	}
   819  }
   820  
   821  func TestConcurrentReadWriteReqBody(t *testing.T) { run(t, testConcurrentReadWriteReqBody) }
   822  func testConcurrentReadWriteReqBody(t *testing.T, mode testMode) {
   823  	const reqBody = "some request body"
   824  	const resBody = "some response body"
   825  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   826  		var wg sync.WaitGroup
   827  		wg.Add(2)
   828  		didRead := make(chan bool, 1)
   829  		// Read in one goroutine.
   830  		go func() {
   831  			defer wg.Done()
   832  			data, err := io.ReadAll(r.Body)
   833  			if string(data) != reqBody {
   834  				t.Errorf("Handler read %q; want %q", data, reqBody)
   835  			}
   836  			if err != nil {
   837  				t.Errorf("Handler Read: %v", err)
   838  			}
   839  			didRead <- true
   840  		}()
   841  		// Write in another goroutine.
   842  		go func() {
   843  			defer wg.Done()
   844  			if mode != http2Mode {
   845  				// our HTTP/1 implementation intentionally
   846  				// doesn't permit writes during read (mostly
   847  				// due to it being undefined); if that is ever
   848  				// relaxed, change this.
   849  				<-didRead
   850  			}
   851  			io.WriteString(w, resBody)
   852  		}()
   853  		wg.Wait()
   854  	}))
   855  	req, _ := NewRequest("POST", cst.ts.URL, strings.NewReader(reqBody))
   856  	req.Header.Add("Expect", "100-continue") // just to complicate things
   857  	res, err := cst.c.Do(req)
   858  	if err != nil {
   859  		t.Fatal(err)
   860  	}
   861  	data, err := io.ReadAll(res.Body)
   862  	defer res.Body.Close()
   863  	if err != nil {
   864  		t.Fatal(err)
   865  	}
   866  	if string(data) != resBody {
   867  		t.Errorf("read %q; want %q", data, resBody)
   868  	}
   869  }
   870  
   871  func TestConnectRequest(t *testing.T) { run(t, testConnectRequest) }
   872  func testConnectRequest(t *testing.T, mode testMode) {
   873  	gotc := make(chan *Request, 1)
   874  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   875  		gotc <- r
   876  	}))
   877  
   878  	u, err := url.Parse(cst.ts.URL)
   879  	if err != nil {
   880  		t.Fatal(err)
   881  	}
   882  
   883  	tests := []struct {
   884  		req  *Request
   885  		want string
   886  	}{
   887  		{
   888  			req: &Request{
   889  				Method: "CONNECT",
   890  				Header: Header{},
   891  				URL:    u,
   892  			},
   893  			want: u.Host,
   894  		},
   895  		{
   896  			req: &Request{
   897  				Method: "CONNECT",
   898  				Header: Header{},
   899  				URL:    u,
   900  				Host:   "example.com:123",
   901  			},
   902  			want: "example.com:123",
   903  		},
   904  	}
   905  
   906  	for i, tt := range tests {
   907  		res, err := cst.c.Do(tt.req)
   908  		if err != nil {
   909  			t.Errorf("%d. RoundTrip = %v", i, err)
   910  			continue
   911  		}
   912  		res.Body.Close()
   913  		req := <-gotc
   914  		if req.Method != "CONNECT" {
   915  			t.Errorf("method = %q; want CONNECT", req.Method)
   916  		}
   917  		if req.Host != tt.want {
   918  			t.Errorf("Host = %q; want %q", req.Host, tt.want)
   919  		}
   920  		if req.URL.Host != tt.want {
   921  			t.Errorf("URL.Host = %q; want %q", req.URL.Host, tt.want)
   922  		}
   923  	}
   924  }
   925  
   926  func TestTransportUserAgent(t *testing.T) { run(t, testTransportUserAgent) }
   927  func testTransportUserAgent(t *testing.T, mode testMode) {
   928  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   929  		fmt.Fprintf(w, "%q", r.Header["User-Agent"])
   930  	}))
   931  
   932  	either := func(a, b string) string {
   933  		if mode == http2Mode {
   934  			return b
   935  		}
   936  		return a
   937  	}
   938  
   939  	tests := []struct {
   940  		setup func(*Request)
   941  		want  string
   942  	}{
   943  		{
   944  			func(r *Request) {},
   945  			either(`["Go-http-client/1.1"]`, `["Go-http-client/2.0"]`),
   946  		},
   947  		{
   948  			func(r *Request) { r.Header.Set("User-Agent", "foo/1.2.3") },
   949  			`["foo/1.2.3"]`,
   950  		},
   951  		{
   952  			func(r *Request) { r.Header["User-Agent"] = []string{"single", "or", "multiple"} },
   953  			`["single"]`,
   954  		},
   955  		{
   956  			func(r *Request) { r.Header.Set("User-Agent", "") },
   957  			`[]`,
   958  		},
   959  		{
   960  			func(r *Request) { r.Header["User-Agent"] = nil },
   961  			`[]`,
   962  		},
   963  	}
   964  	for i, tt := range tests {
   965  		req, _ := NewRequest("GET", cst.ts.URL, nil)
   966  		tt.setup(req)
   967  		res, err := cst.c.Do(req)
   968  		if err != nil {
   969  			t.Errorf("%d. RoundTrip = %v", i, err)
   970  			continue
   971  		}
   972  		slurp, err := io.ReadAll(res.Body)
   973  		res.Body.Close()
   974  		if err != nil {
   975  			t.Errorf("%d. read body = %v", i, err)
   976  			continue
   977  		}
   978  		if string(slurp) != tt.want {
   979  			t.Errorf("%d. body mismatch.\n got: %s\nwant: %s\n", i, slurp, tt.want)
   980  		}
   981  	}
   982  }
   983  
   984  func TestStarRequestMethod(t *testing.T) {
   985  	for _, method := range []string{"FOO", "OPTIONS"} {
   986  		t.Run(method, func(t *testing.T) {
   987  			run(t, func(t *testing.T, mode testMode) {
   988  				testStarRequest(t, method, mode)
   989  			})
   990  		})
   991  	}
   992  }
   993  func testStarRequest(t *testing.T, method string, mode testMode) {
   994  	gotc := make(chan *Request, 1)
   995  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   996  		w.Header().Set("foo", "bar")
   997  		gotc <- r
   998  		w.(Flusher).Flush()
   999  	}))
  1000  
  1001  	u, err := url.Parse(cst.ts.URL)
  1002  	if err != nil {
  1003  		t.Fatal(err)
  1004  	}
  1005  	u.Path = "*"
  1006  
  1007  	req := &Request{
  1008  		Method: method,
  1009  		Header: Header{},
  1010  		URL:    u,
  1011  	}
  1012  
  1013  	res, err := cst.c.Do(req)
  1014  	if err != nil {
  1015  		t.Fatalf("RoundTrip = %v", err)
  1016  	}
  1017  	res.Body.Close()
  1018  
  1019  	wantFoo := "bar"
  1020  	wantLen := int64(-1)
  1021  	if method == "OPTIONS" {
  1022  		wantFoo = ""
  1023  		wantLen = 0
  1024  	}
  1025  	if res.StatusCode != 200 {
  1026  		t.Errorf("status code = %v; want %d", res.Status, 200)
  1027  	}
  1028  	if res.ContentLength != wantLen {
  1029  		t.Errorf("content length = %v; want %d", res.ContentLength, wantLen)
  1030  	}
  1031  	if got := res.Header.Get("foo"); got != wantFoo {
  1032  		t.Errorf("response \"foo\" header = %q; want %q", got, wantFoo)
  1033  	}
  1034  	select {
  1035  	case req = <-gotc:
  1036  	default:
  1037  		req = nil
  1038  	}
  1039  	if req == nil {
  1040  		if method != "OPTIONS" {
  1041  			t.Fatalf("handler never got request")
  1042  		}
  1043  		return
  1044  	}
  1045  	if req.Method != method {
  1046  		t.Errorf("method = %q; want %q", req.Method, method)
  1047  	}
  1048  	if req.URL.Path != "*" {
  1049  		t.Errorf("URL.Path = %q; want *", req.URL.Path)
  1050  	}
  1051  	if req.RequestURI != "*" {
  1052  		t.Errorf("RequestURI = %q; want *", req.RequestURI)
  1053  	}
  1054  }
  1055  
  1056  // Issue 13957
  1057  func TestTransportDiscardsUnneededConns(t *testing.T) {
  1058  	run(t, testTransportDiscardsUnneededConns, []testMode{http2Mode})
  1059  }
  1060  func testTransportDiscardsUnneededConns(t *testing.T, mode testMode) {
  1061  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1062  		fmt.Fprintf(w, "Hello, %v", r.RemoteAddr)
  1063  	}))
  1064  	defer cst.close()
  1065  
  1066  	var numOpen, numClose int32 // atomic
  1067  
  1068  	tlsConfig := &tls.Config{InsecureSkipVerify: true}
  1069  	tr := &Transport{
  1070  		TLSClientConfig: tlsConfig,
  1071  		DialTLS: func(_, addr string) (net.Conn, error) {
  1072  			time.Sleep(10 * time.Millisecond)
  1073  			rc, err := net.Dial("tcp", addr)
  1074  			if err != nil {
  1075  				return nil, err
  1076  			}
  1077  			atomic.AddInt32(&numOpen, 1)
  1078  			c := noteCloseConn{rc, func() { atomic.AddInt32(&numClose, 1) }}
  1079  			return tls.Client(c, tlsConfig), nil
  1080  		},
  1081  	}
  1082  	if err := ExportHttp2ConfigureTransport(tr); err != nil {
  1083  		t.Fatal(err)
  1084  	}
  1085  	defer tr.CloseIdleConnections()
  1086  
  1087  	c := &Client{Transport: tr}
  1088  
  1089  	const N = 10
  1090  	gotBody := make(chan string, N)
  1091  	var wg sync.WaitGroup
  1092  	for i := 0; i < N; i++ {
  1093  		wg.Add(1)
  1094  		go func() {
  1095  			defer wg.Done()
  1096  			resp, err := c.Get(cst.ts.URL)
  1097  			if err != nil {
  1098  				// Try to work around spurious connection reset on loaded system.
  1099  				// See golang.org/issue/33585 and golang.org/issue/36797.
  1100  				time.Sleep(10 * time.Millisecond)
  1101  				resp, err = c.Get(cst.ts.URL)
  1102  				if err != nil {
  1103  					t.Errorf("Get: %v", err)
  1104  					return
  1105  				}
  1106  			}
  1107  			defer resp.Body.Close()
  1108  			slurp, err := io.ReadAll(resp.Body)
  1109  			if err != nil {
  1110  				t.Error(err)
  1111  			}
  1112  			gotBody <- string(slurp)
  1113  		}()
  1114  	}
  1115  	wg.Wait()
  1116  	close(gotBody)
  1117  
  1118  	var last string
  1119  	for got := range gotBody {
  1120  		if last == "" {
  1121  			last = got
  1122  			continue
  1123  		}
  1124  		if got != last {
  1125  			t.Errorf("Response body changed: %q -> %q", last, got)
  1126  		}
  1127  	}
  1128  
  1129  	var open, close int32
  1130  	for i := 0; i < 150; i++ {
  1131  		open, close = atomic.LoadInt32(&numOpen), atomic.LoadInt32(&numClose)
  1132  		if open < 1 {
  1133  			t.Fatalf("open = %d; want at least", open)
  1134  		}
  1135  		if close == open-1 {
  1136  			// Success
  1137  			return
  1138  		}
  1139  		time.Sleep(10 * time.Millisecond)
  1140  	}
  1141  	t.Errorf("%d connections opened, %d closed; want %d to close", open, close, open-1)
  1142  }
  1143  
  1144  // tests that Transport doesn't retain a pointer to the provided request.
  1145  func TestTransportGCRequest(t *testing.T) {
  1146  	run(t, func(t *testing.T, mode testMode) {
  1147  		t.Run("Body", func(t *testing.T) { testTransportGCRequest(t, mode, true) })
  1148  		t.Run("NoBody", func(t *testing.T) { testTransportGCRequest(t, mode, false) })
  1149  	})
  1150  }
  1151  func testTransportGCRequest(t *testing.T, mode testMode, body bool) {
  1152  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1153  		io.ReadAll(r.Body)
  1154  		if body {
  1155  			io.WriteString(w, "Hello.")
  1156  		}
  1157  	}))
  1158  
  1159  	didGC := make(chan struct{})
  1160  	(func() {
  1161  		body := strings.NewReader("some body")
  1162  		req, _ := NewRequest("POST", cst.ts.URL, body)
  1163  		runtime.SetFinalizer(req, func(*Request) { close(didGC) })
  1164  		res, err := cst.c.Do(req)
  1165  		if err != nil {
  1166  			t.Fatal(err)
  1167  		}
  1168  		if _, err := io.ReadAll(res.Body); err != nil {
  1169  			t.Fatal(err)
  1170  		}
  1171  		if err := res.Body.Close(); err != nil {
  1172  			t.Fatal(err)
  1173  		}
  1174  	})()
  1175  	timeout := time.NewTimer(5 * time.Second)
  1176  	defer timeout.Stop()
  1177  	for {
  1178  		select {
  1179  		case <-didGC:
  1180  			return
  1181  		case <-time.After(100 * time.Millisecond):
  1182  			runtime.GC()
  1183  		case <-timeout.C:
  1184  			t.Fatal("never saw GC of request")
  1185  		}
  1186  	}
  1187  }
  1188  
  1189  func TestTransportRejectsInvalidHeaders(t *testing.T) { run(t, testTransportRejectsInvalidHeaders) }
  1190  func testTransportRejectsInvalidHeaders(t *testing.T, mode testMode) {
  1191  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1192  		fmt.Fprintf(w, "Handler saw headers: %q", r.Header)
  1193  	}), optQuietLog)
  1194  	cst.tr.DisableKeepAlives = true
  1195  
  1196  	tests := []struct {
  1197  		key, val string
  1198  		ok       bool
  1199  	}{
  1200  		{"Foo", "capital-key", true}, // verify h2 allows capital keys
  1201  		{"Foo", "foo\x00bar", false}, // \x00 byte in value not allowed
  1202  		{"Foo", "two\nlines", false}, // \n byte in value not allowed
  1203  		{"bogus\nkey", "v", false},   // \n byte also not allowed in key
  1204  		{"A space", "v", false},      // spaces in keys not allowed
  1205  		{"имя", "v", false},          // key must be ascii
  1206  		{"name", "валю", true},       // value may be non-ascii
  1207  		{"", "v", false},             // key must be non-empty
  1208  		{"k", "", true},              // value may be empty
  1209  	}
  1210  	for _, tt := range tests {
  1211  		dialedc := make(chan bool, 1)
  1212  		cst.tr.Dial = func(netw, addr string) (net.Conn, error) {
  1213  			dialedc <- true
  1214  			return net.Dial(netw, addr)
  1215  		}
  1216  		req, _ := NewRequest("GET", cst.ts.URL, nil)
  1217  		req.Header[tt.key] = []string{tt.val}
  1218  		res, err := cst.c.Do(req)
  1219  		var body []byte
  1220  		if err == nil {
  1221  			body, _ = io.ReadAll(res.Body)
  1222  			res.Body.Close()
  1223  		}
  1224  		var dialed bool
  1225  		select {
  1226  		case <-dialedc:
  1227  			dialed = true
  1228  		default:
  1229  		}
  1230  
  1231  		if !tt.ok && dialed {
  1232  			t.Errorf("For key %q, value %q, transport dialed. Expected local failure. Response was: (%v, %v)\nServer replied with: %s", tt.key, tt.val, res, err, body)
  1233  		} else if (err == nil) != tt.ok {
  1234  			t.Errorf("For key %q, value %q; got err = %v; want ok=%v", tt.key, tt.val, err, tt.ok)
  1235  		}
  1236  	}
  1237  }
  1238  
  1239  func TestInterruptWithPanic(t *testing.T) {
  1240  	run(t, func(t *testing.T, mode testMode) {
  1241  		t.Run("boom", func(t *testing.T) { testInterruptWithPanic(t, mode, "boom") })
  1242  		t.Run("nil", func(t *testing.T) { t.Setenv("GODEBUG", "panicnil=1"); testInterruptWithPanic(t, mode, nil) })
  1243  		t.Run("ErrAbortHandler", func(t *testing.T) { testInterruptWithPanic(t, mode, ErrAbortHandler) })
  1244  	}, testNotParallel)
  1245  }
  1246  func testInterruptWithPanic(t *testing.T, mode testMode, panicValue any) {
  1247  	const msg = "hello"
  1248  
  1249  	testDone := make(chan struct{})
  1250  	defer close(testDone)
  1251  
  1252  	var errorLog lockedBytesBuffer
  1253  	gotHeaders := make(chan bool, 1)
  1254  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1255  		io.WriteString(w, msg)
  1256  		w.(Flusher).Flush()
  1257  
  1258  		select {
  1259  		case <-gotHeaders:
  1260  		case <-testDone:
  1261  		}
  1262  		panic(panicValue)
  1263  	}), func(ts *httptest.Server) {
  1264  		ts.Config.ErrorLog = log.New(&errorLog, "", 0)
  1265  	})
  1266  	res, err := cst.c.Get(cst.ts.URL)
  1267  	if err != nil {
  1268  		t.Fatal(err)
  1269  	}
  1270  	gotHeaders <- true
  1271  	defer res.Body.Close()
  1272  	slurp, err := io.ReadAll(res.Body)
  1273  	if string(slurp) != msg {
  1274  		t.Errorf("client read %q; want %q", slurp, msg)
  1275  	}
  1276  	if err == nil {
  1277  		t.Errorf("client read all successfully; want some error")
  1278  	}
  1279  	logOutput := func() string {
  1280  		errorLog.Lock()
  1281  		defer errorLog.Unlock()
  1282  		return errorLog.String()
  1283  	}
  1284  	wantStackLogged := panicValue != nil && panicValue != ErrAbortHandler
  1285  
  1286  	waitCondition(t, 10*time.Millisecond, func(d time.Duration) bool {
  1287  		gotLog := logOutput()
  1288  		if !wantStackLogged {
  1289  			if gotLog == "" {
  1290  				return true
  1291  			}
  1292  			t.Fatalf("want no log output; got: %s", gotLog)
  1293  		}
  1294  		if gotLog == "" {
  1295  			if d > 0 {
  1296  				t.Logf("wanted a stack trace logged; got nothing after %v", d)
  1297  			}
  1298  			return false
  1299  		}
  1300  		if !strings.Contains(gotLog, "created by ") && strings.Count(gotLog, "\n") < 6 {
  1301  			if d > 0 {
  1302  				t.Logf("output doesn't look like a panic stack trace after %v. Got: %s", d, gotLog)
  1303  			}
  1304  			return false
  1305  		}
  1306  		return true
  1307  	})
  1308  }
  1309  
  1310  type lockedBytesBuffer struct {
  1311  	sync.Mutex
  1312  	bytes.Buffer
  1313  }
  1314  
  1315  func (b *lockedBytesBuffer) Write(p []byte) (int, error) {
  1316  	b.Lock()
  1317  	defer b.Unlock()
  1318  	return b.Buffer.Write(p)
  1319  }
  1320  
  1321  // Issue 15366
  1322  func TestH12_AutoGzipWithDumpResponse(t *testing.T) {
  1323  	h12Compare{
  1324  		Handler: func(w ResponseWriter, r *Request) {
  1325  			h := w.Header()
  1326  			h.Set("Content-Encoding", "gzip")
  1327  			h.Set("Content-Length", "23")
  1328  			io.WriteString(w, "\x1f\x8b\b\x00\x00\x00\x00\x00\x00\x00s\xf3\xf7\a\x00\xab'\xd4\x1a\x03\x00\x00\x00")
  1329  		},
  1330  		EarlyCheckResponse: func(proto string, res *Response) {
  1331  			if !res.Uncompressed {
  1332  				t.Errorf("%s: expected Uncompressed to be set", proto)
  1333  			}
  1334  			dump, err := httputil.DumpResponse(res, true)
  1335  			if err != nil {
  1336  				t.Errorf("%s: DumpResponse: %v", proto, err)
  1337  				return
  1338  			}
  1339  			if strings.Contains(string(dump), "Connection: close") {
  1340  				t.Errorf("%s: should not see \"Connection: close\" in dump; got:\n%s", proto, dump)
  1341  			}
  1342  			if !strings.Contains(string(dump), "FOO") {
  1343  				t.Errorf("%s: should see \"FOO\" in response; got:\n%s", proto, dump)
  1344  			}
  1345  		},
  1346  	}.run(t)
  1347  }
  1348  
  1349  // Issue 14607
  1350  func TestCloseIdleConnections(t *testing.T) { run(t, testCloseIdleConnections) }
  1351  func testCloseIdleConnections(t *testing.T, mode testMode) {
  1352  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1353  		w.Header().Set("X-Addr", r.RemoteAddr)
  1354  	}))
  1355  	get := func() string {
  1356  		res, err := cst.c.Get(cst.ts.URL)
  1357  		if err != nil {
  1358  			t.Fatal(err)
  1359  		}
  1360  		res.Body.Close()
  1361  		v := res.Header.Get("X-Addr")
  1362  		if v == "" {
  1363  			t.Fatal("didn't get X-Addr")
  1364  		}
  1365  		return v
  1366  	}
  1367  	a1 := get()
  1368  	cst.tr.CloseIdleConnections()
  1369  	a2 := get()
  1370  	if a1 == a2 {
  1371  		t.Errorf("didn't close connection")
  1372  	}
  1373  }
  1374  
  1375  type noteCloseConn struct {
  1376  	net.Conn
  1377  	closeFunc func()
  1378  }
  1379  
  1380  func (x noteCloseConn) Close() error {
  1381  	x.closeFunc()
  1382  	return x.Conn.Close()
  1383  }
  1384  
  1385  type testErrorReader struct{ t *testing.T }
  1386  
  1387  func (r testErrorReader) Read(p []byte) (n int, err error) {
  1388  	r.t.Error("unexpected Read call")
  1389  	return 0, io.EOF
  1390  }
  1391  
  1392  func TestNoSniffExpectRequestBody(t *testing.T) { run(t, testNoSniffExpectRequestBody) }
  1393  func testNoSniffExpectRequestBody(t *testing.T, mode testMode) {
  1394  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1395  		w.WriteHeader(StatusUnauthorized)
  1396  	}))
  1397  
  1398  	// Set ExpectContinueTimeout non-zero so RoundTrip won't try to write it.
  1399  	cst.tr.ExpectContinueTimeout = 10 * time.Second
  1400  
  1401  	req, err := NewRequest("POST", cst.ts.URL, testErrorReader{t})
  1402  	if err != nil {
  1403  		t.Fatal(err)
  1404  	}
  1405  	req.ContentLength = 0 // so transport is tempted to sniff it
  1406  	req.Header.Set("Expect", "100-continue")
  1407  	res, err := cst.tr.RoundTrip(req)
  1408  	if err != nil {
  1409  		t.Fatal(err)
  1410  	}
  1411  	defer res.Body.Close()
  1412  	if res.StatusCode != StatusUnauthorized {
  1413  		t.Errorf("status code = %v; want %v", res.StatusCode, StatusUnauthorized)
  1414  	}
  1415  }
  1416  
  1417  func TestServerUndeclaredTrailers(t *testing.T) { run(t, testServerUndeclaredTrailers) }
  1418  func testServerUndeclaredTrailers(t *testing.T, mode testMode) {
  1419  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1420  		w.Header().Set("Foo", "Bar")
  1421  		w.Header().Set("Trailer:Foo", "Baz")
  1422  		w.(Flusher).Flush()
  1423  		w.Header().Add("Trailer:Foo", "Baz2")
  1424  		w.Header().Set("Trailer:Bar", "Quux")
  1425  	}))
  1426  	res, err := cst.c.Get(cst.ts.URL)
  1427  	if err != nil {
  1428  		t.Fatal(err)
  1429  	}
  1430  	if _, err := io.Copy(io.Discard, res.Body); err != nil {
  1431  		t.Fatal(err)
  1432  	}
  1433  	res.Body.Close()
  1434  	delete(res.Header, "Date")
  1435  	delete(res.Header, "Content-Type")
  1436  
  1437  	if want := (Header{"Foo": {"Bar"}}); !reflect.DeepEqual(res.Header, want) {
  1438  		t.Errorf("Header = %#v; want %#v", res.Header, want)
  1439  	}
  1440  	if want := (Header{"Foo": {"Baz", "Baz2"}, "Bar": {"Quux"}}); !reflect.DeepEqual(res.Trailer, want) {
  1441  		t.Errorf("Trailer = %#v; want %#v", res.Trailer, want)
  1442  	}
  1443  }
  1444  
  1445  func TestBadResponseAfterReadingBody(t *testing.T) {
  1446  	run(t, testBadResponseAfterReadingBody, []testMode{http1Mode})
  1447  }
  1448  func testBadResponseAfterReadingBody(t *testing.T, mode testMode) {
  1449  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1450  		_, err := io.Copy(io.Discard, r.Body)
  1451  		if err != nil {
  1452  			t.Fatal(err)
  1453  		}
  1454  		c, _, err := w.(Hijacker).Hijack()
  1455  		if err != nil {
  1456  			t.Fatal(err)
  1457  		}
  1458  		defer c.Close()
  1459  		fmt.Fprintln(c, "some bogus crap")
  1460  	}))
  1461  
  1462  	closes := 0
  1463  	res, err := cst.c.Post(cst.ts.URL, "text/plain", countCloseReader{&closes, strings.NewReader("hello")})
  1464  	if err == nil {
  1465  		res.Body.Close()
  1466  		t.Fatal("expected an error to be returned from Post")
  1467  	}
  1468  	if closes != 1 {
  1469  		t.Errorf("closes = %d; want 1", closes)
  1470  	}
  1471  }
  1472  
  1473  func TestWriteHeader0(t *testing.T) { run(t, testWriteHeader0) }
  1474  func testWriteHeader0(t *testing.T, mode testMode) {
  1475  	gotpanic := make(chan bool, 1)
  1476  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1477  		defer close(gotpanic)
  1478  		defer func() {
  1479  			if e := recover(); e != nil {
  1480  				got := fmt.Sprintf("%T, %v", e, e)
  1481  				want := "string, invalid WriteHeader code 0"
  1482  				if got != want {
  1483  					t.Errorf("unexpected panic value:\n got: %v\nwant: %v\n", got, want)
  1484  				}
  1485  				gotpanic <- true
  1486  
  1487  				// Set an explicit 503. This also tests that the WriteHeader call panics
  1488  				// before it recorded that an explicit value was set and that bogus
  1489  				// value wasn't stuck.
  1490  				w.WriteHeader(503)
  1491  			}
  1492  		}()
  1493  		w.WriteHeader(0)
  1494  	}))
  1495  	res, err := cst.c.Get(cst.ts.URL)
  1496  	if err != nil {
  1497  		t.Fatal(err)
  1498  	}
  1499  	if res.StatusCode != 503 {
  1500  		t.Errorf("Response: %v %q; want 503", res.StatusCode, res.Status)
  1501  	}
  1502  	if !<-gotpanic {
  1503  		t.Error("expected panic in handler")
  1504  	}
  1505  }
  1506  
  1507  // Issue 23010: don't be super strict checking WriteHeader's code if
  1508  // it's not even valid to call WriteHeader then anyway.
  1509  func TestWriteHeaderNoCodeCheck(t *testing.T) {
  1510  	run(t, func(t *testing.T, mode testMode) {
  1511  		testWriteHeaderAfterWrite(t, mode, false)
  1512  	})
  1513  }
  1514  func TestWriteHeaderNoCodeCheck_h1hijack(t *testing.T) {
  1515  	testWriteHeaderAfterWrite(t, http1Mode, true)
  1516  }
  1517  func testWriteHeaderAfterWrite(t *testing.T, mode testMode, hijack bool) {
  1518  	var errorLog lockedBytesBuffer
  1519  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1520  		if hijack {
  1521  			conn, _, _ := w.(Hijacker).Hijack()
  1522  			defer conn.Close()
  1523  			conn.Write([]byte("HTTP/1.1 200 OK\r\nContent-Length: 6\r\n\r\nfoo"))
  1524  			w.WriteHeader(0) // verify this doesn't panic if there's already output; Issue 23010
  1525  			conn.Write([]byte("bar"))
  1526  			return
  1527  		}
  1528  		io.WriteString(w, "foo")
  1529  		w.(Flusher).Flush()
  1530  		w.WriteHeader(0) // verify this doesn't panic if there's already output; Issue 23010
  1531  		io.WriteString(w, "bar")
  1532  	}), func(ts *httptest.Server) {
  1533  		ts.Config.ErrorLog = log.New(&errorLog, "", 0)
  1534  	})
  1535  	res, err := cst.c.Get(cst.ts.URL)
  1536  	if err != nil {
  1537  		t.Fatal(err)
  1538  	}
  1539  	defer res.Body.Close()
  1540  	body, err := io.ReadAll(res.Body)
  1541  	if err != nil {
  1542  		t.Fatal(err)
  1543  	}
  1544  	if got, want := string(body), "foobar"; got != want {
  1545  		t.Errorf("got = %q; want %q", got, want)
  1546  	}
  1547  
  1548  	// Also check the stderr output:
  1549  	if mode == http2Mode {
  1550  		// TODO: also emit this log message for HTTP/2?
  1551  		// We historically haven't, so don't check.
  1552  		return
  1553  	}
  1554  	gotLog := strings.TrimSpace(errorLog.String())
  1555  	wantLog := "http: superfluous response.WriteHeader call from net/http_test.testWriteHeaderAfterWrite.func1 (clientserver_test.go:"
  1556  	if hijack {
  1557  		wantLog = "http: response.WriteHeader on hijacked connection from net/http_test.testWriteHeaderAfterWrite.func1 (clientserver_test.go:"
  1558  	}
  1559  	if !strings.HasPrefix(gotLog, wantLog) {
  1560  		t.Errorf("stderr output = %q; want %q", gotLog, wantLog)
  1561  	}
  1562  }
  1563  
  1564  func TestBidiStreamReverseProxy(t *testing.T) {
  1565  	run(t, testBidiStreamReverseProxy, []testMode{http2Mode})
  1566  }
  1567  func testBidiStreamReverseProxy(t *testing.T, mode testMode) {
  1568  	backend := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1569  		if _, err := io.Copy(w, r.Body); err != nil {
  1570  			log.Printf("bidi backend copy: %v", err)
  1571  		}
  1572  	}))
  1573  
  1574  	backURL, err := url.Parse(backend.ts.URL)
  1575  	if err != nil {
  1576  		t.Fatal(err)
  1577  	}
  1578  	rp := httputil.NewSingleHostReverseProxy(backURL)
  1579  	rp.Transport = backend.tr
  1580  	proxy := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1581  		rp.ServeHTTP(w, r)
  1582  	}))
  1583  
  1584  	bodyRes := make(chan any, 1) // error or hash.Hash
  1585  	pr, pw := io.Pipe()
  1586  	req, _ := NewRequest("PUT", proxy.ts.URL, pr)
  1587  	const size = 4 << 20
  1588  	go func() {
  1589  		h := sha1.New()
  1590  		_, err := io.CopyN(io.MultiWriter(h, pw), rand.Reader, size)
  1591  		go pw.Close()
  1592  		if err != nil {
  1593  			bodyRes <- err
  1594  		} else {
  1595  			bodyRes <- h
  1596  		}
  1597  	}()
  1598  	res, err := backend.c.Do(req)
  1599  	if err != nil {
  1600  		t.Fatal(err)
  1601  	}
  1602  	defer res.Body.Close()
  1603  	hgot := sha1.New()
  1604  	n, err := io.Copy(hgot, res.Body)
  1605  	if err != nil {
  1606  		t.Fatal(err)
  1607  	}
  1608  	if n != size {
  1609  		t.Fatalf("got %d bytes; want %d", n, size)
  1610  	}
  1611  	select {
  1612  	case v := <-bodyRes:
  1613  		switch v := v.(type) {
  1614  		default:
  1615  			t.Fatalf("body copy: %v", err)
  1616  		case hash.Hash:
  1617  			if !bytes.Equal(v.Sum(nil), hgot.Sum(nil)) {
  1618  				t.Errorf("written bytes didn't match received bytes")
  1619  			}
  1620  		}
  1621  	case <-time.After(10 * time.Second):
  1622  		t.Fatal("timeout")
  1623  	}
  1624  
  1625  }
  1626  
  1627  // Always use HTTP/1.1 for WebSocket upgrades.
  1628  func TestH12_WebSocketUpgrade(t *testing.T) {
  1629  	h12Compare{
  1630  		Handler: func(w ResponseWriter, r *Request) {
  1631  			h := w.Header()
  1632  			h.Set("Foo", "bar")
  1633  		},
  1634  		ReqFunc: func(c *Client, url string) (*Response, error) {
  1635  			req, _ := NewRequest("GET", url, nil)
  1636  			req.Header.Set("Connection", "Upgrade")
  1637  			req.Header.Set("Upgrade", "WebSocket")
  1638  			return c.Do(req)
  1639  		},
  1640  		EarlyCheckResponse: func(proto string, res *Response) {
  1641  			if res.Proto != "HTTP/1.1" {
  1642  				t.Errorf("%s: expected HTTP/1.1, got %q", proto, res.Proto)
  1643  			}
  1644  			res.Proto = "HTTP/IGNORE" // skip later checks that Proto must be 1.1 vs 2.0
  1645  		},
  1646  	}.run(t)
  1647  }
  1648  
  1649  func TestIdentityTransferEncoding(t *testing.T) { run(t, testIdentityTransferEncoding) }
  1650  func testIdentityTransferEncoding(t *testing.T, mode testMode) {
  1651  	const body = "body"
  1652  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1653  		gotBody, _ := io.ReadAll(r.Body)
  1654  		if got, want := string(gotBody), body; got != want {
  1655  			t.Errorf("got request body = %q; want %q", got, want)
  1656  		}
  1657  		w.Header().Set("Transfer-Encoding", "identity")
  1658  		w.WriteHeader(StatusOK)
  1659  		w.(Flusher).Flush()
  1660  		io.WriteString(w, body)
  1661  	}))
  1662  	req, _ := NewRequest("GET", cst.ts.URL, strings.NewReader(body))
  1663  	res, err := cst.c.Do(req)
  1664  	if err != nil {
  1665  		t.Fatal(err)
  1666  	}
  1667  	defer res.Body.Close()
  1668  	gotBody, err := io.ReadAll(res.Body)
  1669  	if err != nil {
  1670  		t.Fatal(err)
  1671  	}
  1672  	if got, want := string(gotBody), body; got != want {
  1673  		t.Errorf("got response body = %q; want %q", got, want)
  1674  	}
  1675  }
  1676  
  1677  func TestEarlyHintsRequest(t *testing.T) { run(t, testEarlyHintsRequest) }
  1678  func testEarlyHintsRequest(t *testing.T, mode testMode) {
  1679  	var wg sync.WaitGroup
  1680  	wg.Add(1)
  1681  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1682  		h := w.Header()
  1683  
  1684  		h.Add("Content-Length", "123") // must be ignored
  1685  		h.Add("Link", "</style.css>; rel=preload; as=style")
  1686  		h.Add("Link", "</script.js>; rel=preload; as=script")
  1687  		w.WriteHeader(StatusEarlyHints)
  1688  
  1689  		wg.Wait()
  1690  
  1691  		h.Add("Link", "</foo.js>; rel=preload; as=script")
  1692  		w.WriteHeader(StatusEarlyHints)
  1693  
  1694  		w.Write([]byte("Hello"))
  1695  	}))
  1696  
  1697  	checkLinkHeaders := func(t *testing.T, expected, got []string) {
  1698  		t.Helper()
  1699  
  1700  		if len(expected) != len(got) {
  1701  			t.Errorf("got %d expected %d", len(got), len(expected))
  1702  		}
  1703  
  1704  		for i := range expected {
  1705  			if expected[i] != got[i] {
  1706  				t.Errorf("got %q expected %q", got[i], expected[i])
  1707  			}
  1708  		}
  1709  	}
  1710  
  1711  	checkExcludedHeaders := func(t *testing.T, header textproto.MIMEHeader) {
  1712  		t.Helper()
  1713  
  1714  		for _, h := range []string{"Content-Length", "Transfer-Encoding"} {
  1715  			if v, ok := header[h]; ok {
  1716  				t.Errorf("%s is %q; must not be sent", h, v)
  1717  			}
  1718  		}
  1719  	}
  1720  
  1721  	var respCounter uint8
  1722  	trace := &httptrace.ClientTrace{
  1723  		Got1xxResponse: func(code int, header textproto.MIMEHeader) error {
  1724  			switch respCounter {
  1725  			case 0:
  1726  				checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script"}, header["Link"])
  1727  				checkExcludedHeaders(t, header)
  1728  
  1729  				wg.Done()
  1730  			case 1:
  1731  				checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, header["Link"])
  1732  				checkExcludedHeaders(t, header)
  1733  
  1734  			default:
  1735  				t.Error("Unexpected 1xx response")
  1736  			}
  1737  
  1738  			respCounter++
  1739  
  1740  			return nil
  1741  		},
  1742  	}
  1743  	req, _ := NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), "GET", cst.ts.URL, nil)
  1744  
  1745  	res, err := cst.c.Do(req)
  1746  	if err != nil {
  1747  		t.Fatal(err)
  1748  	}
  1749  	defer res.Body.Close()
  1750  
  1751  	checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, res.Header["Link"])
  1752  	if cl := res.Header.Get("Content-Length"); cl != "123" {
  1753  		t.Errorf("Content-Length is %q; want 123", cl)
  1754  	}
  1755  
  1756  	body, _ := io.ReadAll(res.Body)
  1757  	if string(body) != "Hello" {
  1758  		t.Errorf("Read body %q; want Hello", body)
  1759  	}
  1760  }
  1761  

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