Source file src/net/http/client_test.go

     1  // Copyright 2009 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 for client.go
     6  
     7  package http_test
     8  
     9  import (
    10  	"bytes"
    11  	"context"
    12  	"crypto/tls"
    13  	"encoding/base64"
    14  	"errors"
    15  	"fmt"
    16  	"internal/testenv"
    17  	"io"
    18  	"log"
    19  	"net"
    20  	. "net/http"
    21  	"net/http/cookiejar"
    22  	"net/http/httptest"
    23  	"net/url"
    24  	"reflect"
    25  	"runtime"
    26  	"strconv"
    27  	"strings"
    28  	"sync"
    29  	"sync/atomic"
    30  	"testing"
    31  	"testing/synctest"
    32  	"time"
    33  )
    34  
    35  var robotsTxtHandler = HandlerFunc(func(w ResponseWriter, r *Request) {
    36  	w.Header().Set("Last-Modified", "sometime")
    37  	fmt.Fprintf(w, "User-agent: go\nDisallow: /something/")
    38  })
    39  
    40  // pedanticReadAll works like io.ReadAll but additionally
    41  // verifies that r obeys the documented io.Reader contract.
    42  func pedanticReadAll(r io.Reader) (b []byte, err error) {
    43  	var bufa [64]byte
    44  	buf := bufa[:]
    45  	for {
    46  		n, err := r.Read(buf)
    47  		if n == 0 && err == nil {
    48  			return nil, fmt.Errorf("Read: n=0 with err=nil")
    49  		}
    50  		b = append(b, buf[:n]...)
    51  		if err == io.EOF {
    52  			n, err := r.Read(buf)
    53  			if n != 0 || err != io.EOF {
    54  				return nil, fmt.Errorf("Read: n=%d err=%#v after EOF", n, err)
    55  			}
    56  			return b, nil
    57  		}
    58  		if err != nil {
    59  			return b, err
    60  		}
    61  	}
    62  }
    63  
    64  func TestClient(t *testing.T) {
    65  	runSynctest(t, testClient, []testMode{http1Mode, https1Mode, http2UnencryptedMode, http2Mode})
    66  }
    67  func testClient(t *testing.T, mode testMode) {
    68  	ts := newClientServerTest(t, mode, robotsTxtHandler).ts
    69  
    70  	c := ts.Client()
    71  	r, err := c.Get(ts.URL)
    72  	var b []byte
    73  	if err == nil {
    74  		b, err = pedanticReadAll(r.Body)
    75  		r.Body.Close()
    76  	}
    77  	if err != nil {
    78  		t.Error(err)
    79  	} else if s := string(b); !strings.HasPrefix(s, "User-agent:") {
    80  		t.Errorf("Incorrect page body (did not begin with User-agent): %q", s)
    81  	}
    82  }
    83  
    84  func TestClientHead(t *testing.T) { runSynctest(t, testClientHead) }
    85  func testClientHead(t *testing.T, mode testMode) {
    86  	cst := newClientServerTest(t, mode, robotsTxtHandler)
    87  	r, err := cst.c.Head(cst.ts.URL)
    88  	if err != nil {
    89  		t.Fatal(err)
    90  	}
    91  	if _, ok := r.Header["Last-Modified"]; !ok {
    92  		t.Error("Last-Modified header not found.")
    93  	}
    94  }
    95  
    96  type recordingTransport struct {
    97  	req *Request
    98  }
    99  
   100  func (t *recordingTransport) RoundTrip(req *Request) (resp *Response, err error) {
   101  	t.req = req
   102  	return nil, errors.New("dummy impl")
   103  }
   104  
   105  func TestGetRequestFormat(t *testing.T) {
   106  	setParallel(t)
   107  	defer afterTest(t)
   108  	tr := &recordingTransport{}
   109  	client := &Client{Transport: tr}
   110  	url := "http://dummy.faketld/"
   111  	client.Get(url) // Note: doesn't hit network
   112  	if tr.req.Method != "GET" {
   113  		t.Errorf("expected method %q; got %q", "GET", tr.req.Method)
   114  	}
   115  	if tr.req.URL.String() != url {
   116  		t.Errorf("expected URL %q; got %q", url, tr.req.URL.String())
   117  	}
   118  	if tr.req.Header == nil {
   119  		t.Errorf("expected non-nil request Header")
   120  	}
   121  }
   122  
   123  func TestPostRequestFormat(t *testing.T) {
   124  	defer afterTest(t)
   125  	tr := &recordingTransport{}
   126  	client := &Client{Transport: tr}
   127  
   128  	url := "http://dummy.faketld/"
   129  	json := `{"key":"value"}`
   130  	b := strings.NewReader(json)
   131  	client.Post(url, "application/json", b) // Note: doesn't hit network
   132  
   133  	if tr.req.Method != "POST" {
   134  		t.Errorf("got method %q, want %q", tr.req.Method, "POST")
   135  	}
   136  	if tr.req.URL.String() != url {
   137  		t.Errorf("got URL %q, want %q", tr.req.URL.String(), url)
   138  	}
   139  	if tr.req.Header == nil {
   140  		t.Fatalf("expected non-nil request Header")
   141  	}
   142  	if tr.req.Close {
   143  		t.Error("got Close true, want false")
   144  	}
   145  	if g, e := tr.req.ContentLength, int64(len(json)); g != e {
   146  		t.Errorf("got ContentLength %d, want %d", g, e)
   147  	}
   148  }
   149  
   150  func TestPostFormRequestFormat(t *testing.T) {
   151  	defer afterTest(t)
   152  	tr := &recordingTransport{}
   153  	client := &Client{Transport: tr}
   154  
   155  	urlStr := "http://dummy.faketld/"
   156  	form := make(url.Values)
   157  	form.Set("foo", "bar")
   158  	form.Add("foo", "bar2")
   159  	form.Set("bar", "baz")
   160  	client.PostForm(urlStr, form) // Note: doesn't hit network
   161  
   162  	if tr.req.Method != "POST" {
   163  		t.Errorf("got method %q, want %q", tr.req.Method, "POST")
   164  	}
   165  	if tr.req.URL.String() != urlStr {
   166  		t.Errorf("got URL %q, want %q", tr.req.URL.String(), urlStr)
   167  	}
   168  	if tr.req.Header == nil {
   169  		t.Fatalf("expected non-nil request Header")
   170  	}
   171  	if g, e := tr.req.Header.Get("Content-Type"), "application/x-www-form-urlencoded"; g != e {
   172  		t.Errorf("got Content-Type %q, want %q", g, e)
   173  	}
   174  	if tr.req.Close {
   175  		t.Error("got Close true, want false")
   176  	}
   177  	// Depending on map iteration, body can be either of these.
   178  	expectedBody := "foo=bar&foo=bar2&bar=baz"
   179  	expectedBody1 := "bar=baz&foo=bar&foo=bar2"
   180  	if g, e := tr.req.ContentLength, int64(len(expectedBody)); g != e {
   181  		t.Errorf("got ContentLength %d, want %d", g, e)
   182  	}
   183  	bodyb, err := io.ReadAll(tr.req.Body)
   184  	if err != nil {
   185  		t.Fatalf("ReadAll on req.Body: %v", err)
   186  	}
   187  	if g := string(bodyb); g != expectedBody && g != expectedBody1 {
   188  		t.Errorf("got body %q, want %q or %q", g, expectedBody, expectedBody1)
   189  	}
   190  }
   191  
   192  func TestClientRedirects(t *testing.T) { runSynctest(t, testClientRedirects) }
   193  func testClientRedirects(t *testing.T, mode testMode) {
   194  	var ts *httptest.Server
   195  	ts = newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   196  		n, _ := strconv.Atoi(r.FormValue("n"))
   197  		// Test Referer header. (7 is arbitrary position to test at)
   198  		if n == 7 {
   199  			if g, e := r.Referer(), ts.URL+"/?n=6"; e != g {
   200  				t.Errorf("on request ?n=7, expected referer of %q; got %q", e, g)
   201  			}
   202  		}
   203  		if n < 15 {
   204  			Redirect(w, r, fmt.Sprintf("/?n=%d", n+1), StatusTemporaryRedirect)
   205  			return
   206  		}
   207  		fmt.Fprintf(w, "n=%d", n)
   208  	})).ts
   209  
   210  	c := ts.Client()
   211  	_, err := c.Get(ts.URL)
   212  	if e, g := `Get "/?n=10": stopped after 10 redirects`, fmt.Sprintf("%v", err); e != g {
   213  		t.Errorf("with default client Get, expected error %q, got %q", e, g)
   214  	}
   215  
   216  	// HEAD request should also have the ability to follow redirects.
   217  	_, err = c.Head(ts.URL)
   218  	if e, g := `Head "/?n=10": stopped after 10 redirects`, fmt.Sprintf("%v", err); e != g {
   219  		t.Errorf("with default client Head, expected error %q, got %q", e, g)
   220  	}
   221  
   222  	// Do should also follow redirects.
   223  	greq, _ := NewRequest("GET", ts.URL, nil)
   224  	_, err = c.Do(greq)
   225  	if e, g := `Get "/?n=10": stopped after 10 redirects`, fmt.Sprintf("%v", err); e != g {
   226  		t.Errorf("with default client Do, expected error %q, got %q", e, g)
   227  	}
   228  
   229  	// Requests with an empty Method should also redirect (Issue 12705)
   230  	greq.Method = ""
   231  	_, err = c.Do(greq)
   232  	if e, g := `Get "/?n=10": stopped after 10 redirects`, fmt.Sprintf("%v", err); e != g {
   233  		t.Errorf("with default client Do and empty Method, expected error %q, got %q", e, g)
   234  	}
   235  
   236  	var checkErr error
   237  	var lastVia []*Request
   238  	var lastReq *Request
   239  	c.CheckRedirect = func(req *Request, via []*Request) error {
   240  		lastReq = req
   241  		lastVia = via
   242  		return checkErr
   243  	}
   244  	res, err := c.Get(ts.URL)
   245  	if err != nil {
   246  		t.Fatalf("Get error: %v", err)
   247  	}
   248  	res.Body.Close()
   249  	finalURL := res.Request.URL.String()
   250  	if e, g := "<nil>", fmt.Sprintf("%v", err); e != g {
   251  		t.Errorf("with custom client, expected error %q, got %q", e, g)
   252  	}
   253  	if !strings.HasSuffix(finalURL, "/?n=15") {
   254  		t.Errorf("expected final url to end in /?n=15; got url %q", finalURL)
   255  	}
   256  	if e, g := 15, len(lastVia); e != g {
   257  		t.Errorf("expected lastVia to have contained %d elements; got %d", e, g)
   258  	}
   259  
   260  	// Test that Request.Cancel is propagated between requests (Issue 14053)
   261  	creq, _ := NewRequest("HEAD", ts.URL, nil)
   262  	cancel := make(chan struct{})
   263  	creq.Cancel = cancel
   264  	if _, err := c.Do(creq); err != nil {
   265  		t.Fatal(err)
   266  	}
   267  	if lastReq == nil {
   268  		t.Fatal("didn't see redirect")
   269  	}
   270  	if lastReq.Cancel != cancel {
   271  		t.Errorf("expected lastReq to have the cancel channel set on the initial req")
   272  	}
   273  
   274  	checkErr = errors.New("no redirects allowed")
   275  	res, err = c.Get(ts.URL)
   276  	if urlError, ok := err.(*url.Error); !ok || urlError.Err != checkErr {
   277  		t.Errorf("with redirects forbidden, expected a *url.Error with our 'no redirects allowed' error inside; got %#v (%q)", err, err)
   278  	}
   279  	if res == nil {
   280  		t.Fatalf("Expected a non-nil Response on CheckRedirect failure (https://golang.org/issue/3795)")
   281  	}
   282  	res.Body.Close()
   283  	if res.Header.Get("Location") == "" {
   284  		t.Errorf("no Location header in Response")
   285  	}
   286  }
   287  
   288  // Tests that Client redirects' contexts are derived from the original request's context.
   289  func TestClientRedirectsContext(t *testing.T) { runSynctest(t, testClientRedirectsContext) }
   290  func testClientRedirectsContext(t *testing.T, mode testMode) {
   291  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   292  		Redirect(w, r, "/", StatusTemporaryRedirect)
   293  	})).ts
   294  
   295  	ctx, cancel := context.WithCancel(context.Background())
   296  	c := ts.Client()
   297  	c.CheckRedirect = func(req *Request, via []*Request) error {
   298  		cancel()
   299  		select {
   300  		case <-req.Context().Done():
   301  			return nil
   302  		case <-time.After(5 * time.Second):
   303  			return errors.New("redirected request's context never expired after root request canceled")
   304  		}
   305  	}
   306  	req, _ := NewRequestWithContext(ctx, "GET", ts.URL, nil)
   307  	_, err := c.Do(req)
   308  	ue, ok := err.(*url.Error)
   309  	if !ok {
   310  		t.Fatalf("got error %T; want *url.Error", err)
   311  	}
   312  	if ue.Err != context.Canceled {
   313  		t.Errorf("url.Error.Err = %v; want %v", ue.Err, context.Canceled)
   314  	}
   315  }
   316  
   317  type redirectTest struct {
   318  	suffix       string
   319  	want         int // response code
   320  	redirectBody string
   321  }
   322  
   323  func TestPostRedirects(t *testing.T) {
   324  	postRedirectTests := []redirectTest{
   325  		{"/", 200, "first"},
   326  		{"/?code=301&next=302", 200, "c301"},
   327  		{"/?code=302&next=302", 200, "c302"},
   328  		{"/?code=303&next=301", 200, "c303wc301"}, // Issue 9348
   329  		{"/?code=304", 304, "c304"},
   330  		{"/?code=305", 305, "c305"},
   331  		{"/?code=307&next=303,308,302", 200, "c307"},
   332  		{"/?code=308&next=302,301", 200, "c308"},
   333  		{"/?code=404", 404, "c404"},
   334  	}
   335  
   336  	wantSegments := []string{
   337  		`POST / "first"`,
   338  		`POST /?code=301&next=302 "c301"`,
   339  		`GET /?code=302 ""`,
   340  		`GET / ""`,
   341  		`POST /?code=302&next=302 "c302"`,
   342  		`GET /?code=302 ""`,
   343  		`GET / ""`,
   344  		`POST /?code=303&next=301 "c303wc301"`,
   345  		`GET /?code=301 ""`,
   346  		`GET / ""`,
   347  		`POST /?code=304 "c304"`,
   348  		`POST /?code=305 "c305"`,
   349  		`POST /?code=307&next=303,308,302 "c307"`,
   350  		`POST /?code=303&next=308,302 "c307"`,
   351  		`GET /?code=308&next=302 ""`,
   352  		`GET /?code=302 ""`,
   353  		`GET / ""`,
   354  		`POST /?code=308&next=302,301 "c308"`,
   355  		`POST /?code=302&next=301 "c308"`,
   356  		`GET /?code=301 ""`,
   357  		`GET / ""`,
   358  		`POST /?code=404 "c404"`,
   359  	}
   360  	want := strings.Join(wantSegments, "\n")
   361  	runSynctest(t, func(t *testing.T, mode testMode) {
   362  		testRedirectsByMethod(t, mode, "POST", postRedirectTests, want)
   363  	}, http3SkippedMode)
   364  }
   365  
   366  func TestDeleteRedirects(t *testing.T) {
   367  	deleteRedirectTests := []redirectTest{
   368  		{"/", 200, "first"},
   369  		{"/?code=301&next=302,308", 200, "c301"},
   370  		{"/?code=302&next=302", 200, "c302"},
   371  		{"/?code=303", 200, "c303"},
   372  		{"/?code=307&next=301,308,303,302,304", 304, "c307"},
   373  		{"/?code=308&next=307", 200, "c308"},
   374  		{"/?code=404", 404, "c404"},
   375  	}
   376  
   377  	wantSegments := []string{
   378  		`DELETE / "first"`,
   379  		`DELETE /?code=301&next=302,308 "c301"`,
   380  		`GET /?code=302&next=308 ""`,
   381  		`GET /?code=308 ""`,
   382  		`GET / ""`,
   383  		`DELETE /?code=302&next=302 "c302"`,
   384  		`GET /?code=302 ""`,
   385  		`GET / ""`,
   386  		`DELETE /?code=303 "c303"`,
   387  		`GET / ""`,
   388  		`DELETE /?code=307&next=301,308,303,302,304 "c307"`,
   389  		`DELETE /?code=301&next=308,303,302,304 "c307"`,
   390  		`GET /?code=308&next=303,302,304 ""`,
   391  		`GET /?code=303&next=302,304 ""`,
   392  		`GET /?code=302&next=304 ""`,
   393  		`GET /?code=304 ""`,
   394  		`DELETE /?code=308&next=307 "c308"`,
   395  		`DELETE /?code=307 "c308"`,
   396  		`DELETE / "c308"`,
   397  		`DELETE /?code=404 "c404"`,
   398  	}
   399  	want := strings.Join(wantSegments, "\n")
   400  	runSynctest(t, func(t *testing.T, mode testMode) {
   401  		testRedirectsByMethod(t, mode, "DELETE", deleteRedirectTests, want)
   402  	}, http3SkippedMode)
   403  }
   404  
   405  func TestQueryRedirects(t *testing.T) {
   406  	// RFC 10008, Section 2.5: QUERY is safe and idempotent, so it is preserved
   407  	// (with its body) across 301, 302, 307 and 308; only 303 changes the method
   408  	// to GET.
   409  	queryRedirectTests := []redirectTest{
   410  		{"/", 200, "first"},
   411  		{"/?code=302&next=302", 200, "c302"},
   412  		{"/?code=301&next=302,308", 200, "c301"},
   413  		{"/?code=303&next=301", 200, "c303"},
   414  		{"/?code=307&next=303,302", 200, "c307"},
   415  		{"/?code=404", 404, "c404"},
   416  	}
   417  
   418  	wantSegments := []string{
   419  		`QUERY / "first"`,
   420  		`QUERY /?code=302&next=302 "c302"`,
   421  		`QUERY /?code=302 "c302"`,
   422  		`QUERY / "c302"`,
   423  		`QUERY /?code=301&next=302,308 "c301"`,
   424  		`QUERY /?code=302&next=308 "c301"`,
   425  		`QUERY /?code=308 "c301"`,
   426  		`QUERY / "c301"`,
   427  		`QUERY /?code=303&next=301 "c303"`,
   428  		`GET /?code=301 ""`,
   429  		`GET / ""`,
   430  		`QUERY /?code=307&next=303,302 "c307"`,
   431  		`QUERY /?code=303&next=302 "c307"`,
   432  		`GET /?code=302 ""`,
   433  		`GET / ""`,
   434  		`QUERY /?code=404 "c404"`,
   435  	}
   436  	want := strings.Join(wantSegments, "\n")
   437  	runSynctest(t, func(t *testing.T, mode testMode) {
   438  		testRedirectsByMethod(t, mode, "QUERY", queryRedirectTests, want)
   439  	}, http3SkippedMode)
   440  }
   441  
   442  func testRedirectsByMethod(t *testing.T, mode testMode, method string, table []redirectTest, want string) {
   443  	var log struct {
   444  		sync.Mutex
   445  		bytes.Buffer
   446  	}
   447  	var ts *httptest.Server
   448  	ts = newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   449  		log.Lock()
   450  		slurp, _ := io.ReadAll(r.Body)
   451  		fmt.Fprintf(&log.Buffer, "%s %s %q", r.Method, r.RequestURI, slurp)
   452  		if cl := r.Header.Get("Content-Length"); r.Method == "GET" && len(slurp) == 0 && (r.ContentLength != 0 || cl != "") {
   453  			fmt.Fprintf(&log.Buffer, " (but with body=%T, content-length = %v, %q)", r.Body, r.ContentLength, cl)
   454  		}
   455  		log.WriteByte('\n')
   456  		log.Unlock()
   457  		urlQuery := r.URL.Query()
   458  		if v := urlQuery.Get("code"); v != "" {
   459  			location := ts.URL
   460  			if final := urlQuery.Get("next"); final != "" {
   461  				first, rest, _ := strings.Cut(final, ",")
   462  				location = fmt.Sprintf("%s?code=%s", location, first)
   463  				if rest != "" {
   464  					location = fmt.Sprintf("%s&next=%s", location, rest)
   465  				}
   466  			}
   467  			code, _ := strconv.Atoi(v)
   468  			if code/100 == 3 {
   469  				w.Header().Set("Location", location)
   470  			}
   471  			w.WriteHeader(code)
   472  		}
   473  	})).ts
   474  
   475  	c := ts.Client()
   476  	for _, tt := range table {
   477  		content := tt.redirectBody
   478  		req, _ := NewRequest(method, ts.URL+tt.suffix, strings.NewReader(content))
   479  		req.GetBody = func() (io.ReadCloser, error) { return io.NopCloser(strings.NewReader(content)), nil }
   480  		res, err := c.Do(req)
   481  		if err != nil {
   482  			t.Fatal(err)
   483  		}
   484  		if res.StatusCode != tt.want {
   485  			t.Errorf("POST %s: status code = %d; want %d", tt.suffix, res.StatusCode, tt.want)
   486  		}
   487  	}
   488  	log.Lock()
   489  	got := log.String()
   490  	log.Unlock()
   491  
   492  	got = strings.TrimSpace(got)
   493  	want = strings.TrimSpace(want)
   494  
   495  	if got != want {
   496  		got, want, lines := removeCommonLines(got, want)
   497  		t.Errorf("Log differs after %d common lines.\n\nGot:\n%s\n\nWant:\n%s\n", lines, got, want)
   498  	}
   499  }
   500  
   501  func removeCommonLines(a, b string) (asuffix, bsuffix string, commonLines int) {
   502  	for {
   503  		nl := strings.IndexByte(a, '\n')
   504  		if nl < 0 {
   505  			return a, b, commonLines
   506  		}
   507  		line := a[:nl+1]
   508  		if !strings.HasPrefix(b, line) {
   509  			return a, b, commonLines
   510  		}
   511  		commonLines++
   512  		a = a[len(line):]
   513  		b = b[len(line):]
   514  	}
   515  }
   516  
   517  func TestClientRedirectUseResponse(t *testing.T) { runSynctest(t, testClientRedirectUseResponse) }
   518  func testClientRedirectUseResponse(t *testing.T, mode testMode) {
   519  	const body = "Hello, world."
   520  	var ts *httptest.Server
   521  	ts = newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   522  		if strings.Contains(r.URL.Path, "/other") {
   523  			io.WriteString(w, "wrong body")
   524  		} else {
   525  			scheme := "http"
   526  			if r.TLS != nil {
   527  				scheme = "https"
   528  			}
   529  			w.Header().Set("Location", fmt.Sprintf("%s://%s/other", scheme, r.Host))
   530  			w.WriteHeader(StatusFound)
   531  			io.WriteString(w, body)
   532  		}
   533  	})).ts
   534  
   535  	c := ts.Client()
   536  	c.CheckRedirect = func(req *Request, via []*Request) error {
   537  		if req.Response == nil {
   538  			t.Error("expected non-nil Request.Response")
   539  		}
   540  		return ErrUseLastResponse
   541  	}
   542  	res, err := c.Get(ts.URL)
   543  	if err != nil {
   544  		t.Fatal(err)
   545  	}
   546  	if res.StatusCode != StatusFound {
   547  		t.Errorf("status = %d; want %d", res.StatusCode, StatusFound)
   548  	}
   549  	defer res.Body.Close()
   550  	slurp, err := io.ReadAll(res.Body)
   551  	if err != nil {
   552  		t.Fatal(err)
   553  	}
   554  	if string(slurp) != body {
   555  		t.Errorf("body = %q; want %q", slurp, body)
   556  	}
   557  }
   558  
   559  // Issues 17773 and 49281: don't follow a 3xx if the response doesn't
   560  // have a Location header.
   561  func TestClientRedirectNoLocation(t *testing.T) { runNoSynctest(t, testClientRedirectNoLocation) }
   562  func testClientRedirectNoLocation(t *testing.T, mode testMode) {
   563  	for _, code := range []int{301, 308} {
   564  		synctest.Subtest(t, fmt.Sprint(code), func(t *testing.T) {
   565  			cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   566  				w.Header().Set("Foo", "Bar")
   567  				w.WriteHeader(code)
   568  			}))
   569  			res, err := cst.c.Get(cst.ts.URL)
   570  			if err != nil {
   571  				t.Fatal(err)
   572  			}
   573  			res.Body.Close()
   574  			if res.StatusCode != code {
   575  				t.Errorf("status = %d; want %d", res.StatusCode, code)
   576  			}
   577  			if got := res.Header.Get("Foo"); got != "Bar" {
   578  				t.Errorf("Foo header = %q; want Bar", got)
   579  			}
   580  		})
   581  	}
   582  }
   583  
   584  // Don't follow a 307/308 if we can't resent the request body.
   585  func TestClientRedirect308NoGetBody(t *testing.T) { runSynctest(t, testClientRedirect308NoGetBody) }
   586  func testClientRedirect308NoGetBody(t *testing.T, mode testMode) {
   587  	const fakeURL = "https://localhost:1234/" // won't be hit
   588  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   589  		w.Header().Set("Location", fakeURL)
   590  		w.WriteHeader(308)
   591  	})).ts
   592  	req, err := NewRequest("POST", ts.URL, strings.NewReader("some body"))
   593  	if err != nil {
   594  		t.Fatal(err)
   595  	}
   596  	c := ts.Client()
   597  	req.GetBody = nil // so it can't rewind.
   598  	res, err := c.Do(req)
   599  	if err != nil {
   600  		t.Fatal(err)
   601  	}
   602  	res.Body.Close()
   603  	if res.StatusCode != 308 {
   604  		t.Errorf("status = %d; want %d", res.StatusCode, 308)
   605  	}
   606  	if got := res.Header.Get("Location"); got != fakeURL {
   607  		t.Errorf("Location header = %q; want %q", got, fakeURL)
   608  	}
   609  }
   610  
   611  var expectedCookies = []*Cookie{
   612  	{Name: "ChocolateChip", Value: "tasty"},
   613  	{Name: "First", Value: "Hit"},
   614  	{Name: "Second", Value: "Hit"},
   615  }
   616  
   617  var echoCookiesRedirectHandler = HandlerFunc(func(w ResponseWriter, r *Request) {
   618  	for _, cookie := range r.Cookies() {
   619  		SetCookie(w, cookie)
   620  	}
   621  	if r.URL.Path == "/" {
   622  		SetCookie(w, expectedCookies[1])
   623  		Redirect(w, r, "/second", StatusMovedPermanently)
   624  	} else {
   625  		SetCookie(w, expectedCookies[2])
   626  		w.Write([]byte("hello"))
   627  	}
   628  })
   629  
   630  func TestHostMismatchCookies(t *testing.T) { runSynctest(t, testHostMismatchCookies) }
   631  func testHostMismatchCookies(t *testing.T, mode testMode) {
   632  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   633  		for _, c := range r.Cookies() {
   634  			c.Value = "SetOnServer"
   635  			SetCookie(w, c)
   636  		}
   637  	})).ts
   638  
   639  	reqURL, _ := url.Parse(ts.URL)
   640  	hostURL := *reqURL
   641  	hostURL.Host = "cookies.example.com"
   642  
   643  	c := ts.Client()
   644  	c.Jar = new(TestJar)
   645  	c.Jar.SetCookies(reqURL, []*Cookie{{Name: "First", Value: "SetOnClient"}})
   646  	c.Jar.SetCookies(&hostURL, []*Cookie{{Name: "Second", Value: "SetOnClient"}})
   647  
   648  	req, _ := NewRequest("GET", ts.URL, NoBody)
   649  	req.Host = hostURL.Host
   650  	resp, err := c.Do(req)
   651  	if err != nil {
   652  		t.Fatalf("Get: %v", err)
   653  	}
   654  	resp.Body.Close()
   655  
   656  	matchReturnedCookies(t, []*Cookie{{Name: "First", Value: "SetOnClient"}}, c.Jar.Cookies(reqURL))
   657  	matchReturnedCookies(t, []*Cookie{{Name: "Second", Value: "SetOnServer"}}, c.Jar.Cookies(&hostURL))
   658  }
   659  
   660  func TestClientSendsCookieFromJar(t *testing.T) {
   661  	defer afterTest(t)
   662  	tr := &recordingTransport{}
   663  	client := &Client{Transport: tr}
   664  	client.Jar = &TestJar{perURL: make(map[string][]*Cookie)}
   665  	us := "http://dummy.faketld/"
   666  	u, _ := url.Parse(us)
   667  	client.Jar.SetCookies(u, expectedCookies)
   668  
   669  	client.Get(us) // Note: doesn't hit network
   670  	matchReturnedCookies(t, expectedCookies, tr.req.Cookies())
   671  
   672  	client.Head(us) // Note: doesn't hit network
   673  	matchReturnedCookies(t, expectedCookies, tr.req.Cookies())
   674  
   675  	client.Post(us, "text/plain", strings.NewReader("body")) // Note: doesn't hit network
   676  	matchReturnedCookies(t, expectedCookies, tr.req.Cookies())
   677  
   678  	client.PostForm(us, url.Values{}) // Note: doesn't hit network
   679  	matchReturnedCookies(t, expectedCookies, tr.req.Cookies())
   680  
   681  	req, _ := NewRequest("GET", us, nil)
   682  	client.Do(req) // Note: doesn't hit network
   683  	matchReturnedCookies(t, expectedCookies, tr.req.Cookies())
   684  
   685  	req, _ = NewRequest("POST", us, nil)
   686  	client.Do(req) // Note: doesn't hit network
   687  	matchReturnedCookies(t, expectedCookies, tr.req.Cookies())
   688  }
   689  
   690  // Just enough correctness for our redirect tests. Uses the URL.Host as the
   691  // scope of all cookies.
   692  type TestJar struct {
   693  	m      sync.Mutex
   694  	perURL map[string][]*Cookie
   695  }
   696  
   697  func (j *TestJar) SetCookies(u *url.URL, cookies []*Cookie) {
   698  	j.m.Lock()
   699  	defer j.m.Unlock()
   700  	if j.perURL == nil {
   701  		j.perURL = make(map[string][]*Cookie)
   702  	}
   703  	j.perURL[u.Host] = cookies
   704  }
   705  
   706  func (j *TestJar) Cookies(u *url.URL) []*Cookie {
   707  	j.m.Lock()
   708  	defer j.m.Unlock()
   709  	return j.perURL[u.Host]
   710  }
   711  
   712  func TestRedirectCookiesJar(t *testing.T) { runSynctest(t, testRedirectCookiesJar) }
   713  func testRedirectCookiesJar(t *testing.T, mode testMode) {
   714  	var ts *httptest.Server
   715  	ts = newClientServerTest(t, mode, echoCookiesRedirectHandler).ts
   716  	c := ts.Client()
   717  	c.Jar = new(TestJar)
   718  	u, _ := url.Parse(ts.URL)
   719  	c.Jar.SetCookies(u, []*Cookie{expectedCookies[0]})
   720  	resp, err := c.Get(ts.URL)
   721  	if err != nil {
   722  		t.Fatalf("Get: %v", err)
   723  	}
   724  	resp.Body.Close()
   725  	matchReturnedCookies(t, expectedCookies, resp.Cookies())
   726  }
   727  
   728  func matchReturnedCookies(t *testing.T, expected, given []*Cookie) {
   729  	if len(given) != len(expected) {
   730  		t.Logf("Received cookies: %v", given)
   731  		t.Errorf("Expected %d cookies, got %d", len(expected), len(given))
   732  	}
   733  	for _, ec := range expected {
   734  		foundC := false
   735  		for _, c := range given {
   736  			if ec.Name == c.Name && ec.Value == c.Value {
   737  				foundC = true
   738  				break
   739  			}
   740  		}
   741  		if !foundC {
   742  			t.Errorf("Missing cookie %v", ec)
   743  		}
   744  	}
   745  }
   746  
   747  func TestJarCalls(t *testing.T) { runSynctest(t, testJarCalls, []testMode{http1Mode}) }
   748  func testJarCalls(t *testing.T, mode testMode) {
   749  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   750  		pathSuffix := r.RequestURI[1:]
   751  		if r.RequestURI == "/nosetcookie" {
   752  			return // don't set cookies for this path
   753  		}
   754  		SetCookie(w, &Cookie{Name: "name" + pathSuffix, Value: "val" + pathSuffix})
   755  		if r.RequestURI == "/" {
   756  			Redirect(w, r, "http://secondhost.fake/secondpath", 302)
   757  		}
   758  	})).ts
   759  	jar := new(RecordingJar)
   760  	c := ts.Client()
   761  	c.Jar = jar
   762  	c.Transport.(*Transport).Dial = func(_ string, _ string) (net.Conn, error) {
   763  		return net.Dial("tcp", ts.Listener.Addr().String())
   764  	}
   765  	_, err := c.Get("http://firsthost.fake/")
   766  	if err != nil {
   767  		t.Fatal(err)
   768  	}
   769  	_, err = c.Get("http://firsthost.fake/nosetcookie")
   770  	if err != nil {
   771  		t.Fatal(err)
   772  	}
   773  	got := jar.log.String()
   774  	want := `Cookies("http://firsthost.fake/")
   775  SetCookie("http://firsthost.fake/", [name=val])
   776  Cookies("http://secondhost.fake/secondpath")
   777  SetCookie("http://secondhost.fake/secondpath", [namesecondpath=valsecondpath])
   778  Cookies("http://firsthost.fake/nosetcookie")
   779  `
   780  	if got != want {
   781  		t.Errorf("Got Jar calls:\n%s\nWant:\n%s", got, want)
   782  	}
   783  }
   784  
   785  // RecordingJar keeps a log of calls made to it, without
   786  // tracking any cookies.
   787  type RecordingJar struct {
   788  	mu  sync.Mutex
   789  	log bytes.Buffer
   790  }
   791  
   792  func (j *RecordingJar) SetCookies(u *url.URL, cookies []*Cookie) {
   793  	j.logf("SetCookie(%q, %v)\n", u, cookies)
   794  }
   795  
   796  func (j *RecordingJar) Cookies(u *url.URL) []*Cookie {
   797  	j.logf("Cookies(%q)\n", u)
   798  	return nil
   799  }
   800  
   801  func (j *RecordingJar) logf(format string, args ...any) {
   802  	j.mu.Lock()
   803  	defer j.mu.Unlock()
   804  	fmt.Fprintf(&j.log, format, args...)
   805  }
   806  
   807  func TestStreamingGet(t *testing.T) { runSynctest(t, testStreamingGet) }
   808  func testStreamingGet(t *testing.T, mode testMode) {
   809  	say := make(chan string)
   810  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   811  		w.(Flusher).Flush()
   812  		for str := range say {
   813  			w.Write([]byte(str))
   814  			w.(Flusher).Flush()
   815  		}
   816  	}))
   817  
   818  	c := cst.c
   819  	res, err := c.Get(cst.ts.URL)
   820  	if err != nil {
   821  		t.Fatal(err)
   822  	}
   823  	var buf [10]byte
   824  	for _, str := range []string{"i", "am", "also", "known", "as", "comet"} {
   825  		say <- str
   826  		n, err := io.ReadFull(res.Body, buf[:len(str)])
   827  		if err != nil {
   828  			t.Fatalf("ReadFull on %q: %v", str, err)
   829  		}
   830  		if n != len(str) {
   831  			t.Fatalf("Receiving %q, only read %d bytes", str, n)
   832  		}
   833  		got := string(buf[0:n])
   834  		if got != str {
   835  			t.Fatalf("Expected %q, got %q", str, got)
   836  		}
   837  	}
   838  	close(say)
   839  	_, err = io.ReadFull(res.Body, buf[0:1])
   840  	if err != io.EOF {
   841  		t.Fatalf("at end expected EOF, got %v", err)
   842  	}
   843  }
   844  
   845  type writeCountingConn struct {
   846  	net.Conn
   847  	count *int
   848  }
   849  
   850  func (c *writeCountingConn) Write(p []byte) (int, error) {
   851  	*c.count++
   852  	return c.Conn.Write(p)
   853  }
   854  
   855  // TestClientWrites verifies that client requests are buffered and we
   856  // don't send a TCP packet per line of the http request + body.
   857  func TestClientWrites(t *testing.T) { runNoSynctest(t, testClientWrites, []testMode{http1Mode}) }
   858  func testClientWrites(t *testing.T, mode testMode) {
   859  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   860  	}), optRealNet).ts
   861  
   862  	writes := 0
   863  	dialer := func(netz string, addr string) (net.Conn, error) {
   864  		c, err := net.Dial(netz, addr)
   865  		if err == nil {
   866  			c = &writeCountingConn{c, &writes}
   867  		}
   868  		return c, err
   869  	}
   870  	c := ts.Client()
   871  	c.Transport.(*Transport).Dial = dialer
   872  
   873  	_, err := c.Get(ts.URL)
   874  	if err != nil {
   875  		t.Fatal(err)
   876  	}
   877  	if writes != 1 {
   878  		t.Errorf("Get request did %d Write calls, want 1", writes)
   879  	}
   880  
   881  	writes = 0
   882  	_, err = c.PostForm(ts.URL, url.Values{"foo": {"bar"}})
   883  	if err != nil {
   884  		t.Fatal(err)
   885  	}
   886  	if writes != 1 {
   887  		t.Errorf("Post request did %d Write calls, want 1", writes)
   888  	}
   889  }
   890  
   891  func TestClientInsecureTransport(t *testing.T) {
   892  	runNoSynctest(t, testClientInsecureTransport, []testMode{https1Mode, http2Mode})
   893  }
   894  func testClientInsecureTransport(t *testing.T, mode testMode) {
   895  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   896  		w.Write([]byte("Hello"))
   897  	}), optRealNet)
   898  	ts := cst.ts
   899  	errLog := new(strings.Builder)
   900  	ts.Config.ErrorLog = log.New(errLog, "", 0)
   901  
   902  	// TODO(bradfitz): add tests for skipping hostname checks too?
   903  	// would require a new cert for testing, and probably
   904  	// redundant with these tests.
   905  	c := ts.Client()
   906  	for _, insecure := range []bool{true, false} {
   907  		c.Transport.(*Transport).TLSClientConfig = &tls.Config{
   908  			InsecureSkipVerify: insecure,
   909  			NextProtos:         cst.tr.TLSClientConfig.NextProtos,
   910  		}
   911  		req, _ := NewRequest("GET", ts.URL, nil)
   912  		req.Header.Set("Connection", "close") // don't reuse this connection
   913  		res, err := c.Do(req)
   914  		if (err == nil) != insecure {
   915  			t.Errorf("insecure=%v: got unexpected err=%v", insecure, err)
   916  		}
   917  		if res != nil {
   918  			res.Body.Close()
   919  		}
   920  	}
   921  
   922  	cst.close()
   923  	if !strings.Contains(errLog.String(), "TLS handshake error") {
   924  		t.Errorf("expected an error log message containing 'TLS handshake error'; got %q", errLog)
   925  	}
   926  }
   927  
   928  func TestClientErrorWithRequestURI(t *testing.T) {
   929  	defer afterTest(t)
   930  	req, _ := NewRequest("GET", "http://localhost:1234/", nil)
   931  	req.RequestURI = "/this/field/is/illegal/and/should/error/"
   932  	_, err := DefaultClient.Do(req)
   933  	if err == nil {
   934  		t.Fatalf("expected an error")
   935  	}
   936  	if !strings.Contains(err.Error(), "RequestURI") {
   937  		t.Errorf("wanted error mentioning RequestURI; got error: %v", err)
   938  	}
   939  }
   940  
   941  func TestClientWithCorrectTLSServerName(t *testing.T) {
   942  	runSynctest(t, testClientWithCorrectTLSServerName, []testMode{https1Mode, http2Mode})
   943  }
   944  func testClientWithCorrectTLSServerName(t *testing.T, mode testMode) {
   945  	const serverName = "example.com"
   946  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   947  		if r.TLS.ServerName != serverName {
   948  			t.Errorf("expected client to set ServerName %q, got: %q", serverName, r.TLS.ServerName)
   949  		}
   950  	})).ts
   951  
   952  	c := ts.Client()
   953  	c.Transport.(*Transport).TLSClientConfig.ServerName = serverName
   954  	if _, err := c.Get("https://" + serverName); err != nil {
   955  		t.Fatalf("expected successful TLS connection, got error: %v", err)
   956  	}
   957  }
   958  
   959  func TestClientWithIncorrectTLSServerName(t *testing.T) {
   960  	runNoSynctest(t, testClientWithIncorrectTLSServerName, []testMode{https1Mode, http2Mode})
   961  }
   962  func testClientWithIncorrectTLSServerName(t *testing.T, mode testMode) {
   963  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {}), optRealNet)
   964  	ts := cst.ts
   965  	errLog := new(strings.Builder)
   966  	ts.Config.ErrorLog = log.New(errLog, "", 0)
   967  
   968  	c := ts.Client()
   969  	c.Transport.(*Transport).TLSClientConfig.ServerName = "badserver"
   970  	_, err := c.Get(ts.URL)
   971  	if err == nil {
   972  		t.Fatalf("expected an error")
   973  	}
   974  	if !strings.Contains(err.Error(), "127.0.0.1") || !strings.Contains(err.Error(), "badserver") {
   975  		t.Errorf("wanted error mentioning 127.0.0.1 and badserver; got error: %v", err)
   976  	}
   977  
   978  	cst.close()
   979  	if !strings.Contains(errLog.String(), "TLS handshake error") {
   980  		t.Errorf("expected an error log message containing 'TLS handshake error'; got %q", errLog)
   981  	}
   982  }
   983  
   984  // Test for golang.org/issue/5829; the Transport should respect TLSClientConfig.ServerName
   985  // when not empty.
   986  //
   987  // tls.Config.ServerName (non-empty, set to "example.com") takes
   988  // precedence over "some-other-host.tld" which previously incorrectly
   989  // took precedence. We don't actually connect to (or even resolve)
   990  // "some-other-host.tld", though, because of the Transport.Dial hook.
   991  //
   992  // The httptest.Server has a cert with "example.com" as its name.
   993  func TestTransportUsesTLSConfigServerName(t *testing.T) {
   994  	runSynctest(t, testTransportUsesTLSConfigServerName, []testMode{https1Mode, http2Mode})
   995  }
   996  func testTransportUsesTLSConfigServerName(t *testing.T, mode testMode) {
   997  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   998  		w.Write([]byte("Hello"))
   999  	})).ts
  1000  
  1001  	c := ts.Client()
  1002  	tr := c.Transport.(*Transport)
  1003  	tr.TLSClientConfig.ServerName = "example.com" // one of httptest's Server cert names
  1004  	tr.Dial = func(netw, addr string) (net.Conn, error) {
  1005  		return net.Dial(netw, ts.Listener.Addr().String())
  1006  	}
  1007  	res, err := c.Get("https://some-other-host.tld/")
  1008  	if err != nil {
  1009  		t.Fatal(err)
  1010  	}
  1011  	res.Body.Close()
  1012  }
  1013  
  1014  func TestResponseSetsTLSConnectionState(t *testing.T) {
  1015  	runSynctest(t, testResponseSetsTLSConnectionState, []testMode{https1Mode})
  1016  }
  1017  func testResponseSetsTLSConnectionState(t *testing.T, mode testMode) {
  1018  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1019  		w.Write([]byte("Hello"))
  1020  	})).ts
  1021  
  1022  	c := ts.Client()
  1023  	tr := c.Transport.(*Transport)
  1024  	tr.TLSClientConfig.CipherSuites = []uint16{tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256}
  1025  	tr.TLSClientConfig.MaxVersion = tls.VersionTLS12 // to get to pick the cipher suite
  1026  	tr.Dial = func(netw, addr string) (net.Conn, error) {
  1027  		return net.Dial(netw, ts.Listener.Addr().String())
  1028  	}
  1029  	res, err := c.Get("https://example.com/")
  1030  	if err != nil {
  1031  		t.Fatal(err)
  1032  	}
  1033  	defer res.Body.Close()
  1034  	if res.TLS == nil {
  1035  		t.Fatal("Response didn't set TLS Connection State.")
  1036  	}
  1037  	if got, want := res.TLS.CipherSuite, tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256; got != want {
  1038  		t.Errorf("TLS Cipher Suite = %d; want %d", got, want)
  1039  	}
  1040  }
  1041  
  1042  // Check that an HTTPS client can interpret a particular TLS error
  1043  // to determine that the server is speaking HTTP.
  1044  // See golang.org/issue/11111.
  1045  func TestHTTPSClientDetectsHTTPServer(t *testing.T) {
  1046  	runNoSynctest(t, testHTTPSClientDetectsHTTPServer, []testMode{http1Mode})
  1047  }
  1048  func testHTTPSClientDetectsHTTPServer(t *testing.T, mode testMode) {
  1049  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {}), optRealNet).ts
  1050  	ts.Config.ErrorLog = quietLog
  1051  
  1052  	_, err := Get(strings.Replace(ts.URL, "http", "https", 1))
  1053  	if got := err.Error(); !strings.Contains(got, "HTTP response to HTTPS client") {
  1054  		t.Fatalf("error = %q; want error indicating HTTP response to HTTPS request", got)
  1055  	}
  1056  }
  1057  
  1058  // Verify Response.ContentLength is populated. https://golang.org/issue/4126
  1059  func TestClientHeadContentLength(t *testing.T) { runSynctest(t, testClientHeadContentLength) }
  1060  func testClientHeadContentLength(t *testing.T, mode testMode) {
  1061  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1062  		if v := r.FormValue("cl"); v != "" {
  1063  			w.Header().Set("Content-Length", v)
  1064  		}
  1065  	}))
  1066  	tests := []struct {
  1067  		suffix string
  1068  		want   int64
  1069  	}{
  1070  		{"/?cl=1234", 1234},
  1071  		{"/?cl=0", 0},
  1072  		{"", -1},
  1073  	}
  1074  	for _, tt := range tests {
  1075  		req, _ := NewRequest("HEAD", cst.ts.URL+tt.suffix, nil)
  1076  		res, err := cst.c.Do(req)
  1077  		if err != nil {
  1078  			t.Fatal(err)
  1079  		}
  1080  		if res.ContentLength != tt.want {
  1081  			t.Errorf("Content-Length = %d; want %d", res.ContentLength, tt.want)
  1082  		}
  1083  		bs, err := io.ReadAll(res.Body)
  1084  		if err != nil {
  1085  			t.Fatal(err)
  1086  		}
  1087  		if len(bs) != 0 {
  1088  			t.Errorf("Unexpected content: %q", bs)
  1089  		}
  1090  	}
  1091  }
  1092  
  1093  func TestEmptyPasswordAuth(t *testing.T) { runSynctest(t, testEmptyPasswordAuth) }
  1094  func testEmptyPasswordAuth(t *testing.T, mode testMode) {
  1095  	gopher := "gopher"
  1096  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1097  		auth := r.Header.Get("Authorization")
  1098  		if strings.HasPrefix(auth, "Basic ") {
  1099  			encoded := auth[6:]
  1100  			decoded, err := base64.StdEncoding.DecodeString(encoded)
  1101  			if err != nil {
  1102  				t.Fatal(err)
  1103  			}
  1104  			expected := gopher + ":"
  1105  			s := string(decoded)
  1106  			if expected != s {
  1107  				t.Errorf("Invalid Authorization header. Got %q, wanted %q", s, expected)
  1108  			}
  1109  		} else {
  1110  			t.Errorf("Invalid auth %q", auth)
  1111  		}
  1112  	})).ts
  1113  	defer ts.Close()
  1114  	req, err := NewRequest("GET", ts.URL, nil)
  1115  	if err != nil {
  1116  		t.Fatal(err)
  1117  	}
  1118  	req.URL.User = url.User(gopher)
  1119  	c := ts.Client()
  1120  	resp, err := c.Do(req)
  1121  	if err != nil {
  1122  		t.Fatal(err)
  1123  	}
  1124  	defer resp.Body.Close()
  1125  }
  1126  
  1127  func TestBasicAuth(t *testing.T) {
  1128  	defer afterTest(t)
  1129  	tr := &recordingTransport{}
  1130  	client := &Client{Transport: tr}
  1131  
  1132  	url := "http://My%20User:My%20Pass@dummy.faketld/"
  1133  	expected := "My User:My Pass"
  1134  	client.Get(url)
  1135  
  1136  	if tr.req.Method != "GET" {
  1137  		t.Errorf("got method %q, want %q", tr.req.Method, "GET")
  1138  	}
  1139  	if tr.req.URL.String() != url {
  1140  		t.Errorf("got URL %q, want %q", tr.req.URL.String(), url)
  1141  	}
  1142  	if tr.req.Header == nil {
  1143  		t.Fatalf("expected non-nil request Header")
  1144  	}
  1145  	auth := tr.req.Header.Get("Authorization")
  1146  	if strings.HasPrefix(auth, "Basic ") {
  1147  		encoded := auth[6:]
  1148  		decoded, err := base64.StdEncoding.DecodeString(encoded)
  1149  		if err != nil {
  1150  			t.Fatal(err)
  1151  		}
  1152  		s := string(decoded)
  1153  		if expected != s {
  1154  			t.Errorf("Invalid Authorization header. Got %q, wanted %q", s, expected)
  1155  		}
  1156  	} else {
  1157  		t.Errorf("Invalid auth %q", auth)
  1158  	}
  1159  }
  1160  
  1161  func TestBasicAuthHeadersPreserved(t *testing.T) {
  1162  	defer afterTest(t)
  1163  	tr := &recordingTransport{}
  1164  	client := &Client{Transport: tr}
  1165  
  1166  	// If Authorization header is provided, username in URL should not override it
  1167  	url := "http://My%20User@dummy.faketld/"
  1168  	req, err := NewRequest("GET", url, nil)
  1169  	if err != nil {
  1170  		t.Fatal(err)
  1171  	}
  1172  	req.SetBasicAuth("My User", "My Pass")
  1173  	expected := "My User:My Pass"
  1174  	client.Do(req)
  1175  
  1176  	if tr.req.Method != "GET" {
  1177  		t.Errorf("got method %q, want %q", tr.req.Method, "GET")
  1178  	}
  1179  	if tr.req.URL.String() != url {
  1180  		t.Errorf("got URL %q, want %q", tr.req.URL.String(), url)
  1181  	}
  1182  	if tr.req.Header == nil {
  1183  		t.Fatalf("expected non-nil request Header")
  1184  	}
  1185  	auth := tr.req.Header.Get("Authorization")
  1186  	if strings.HasPrefix(auth, "Basic ") {
  1187  		encoded := auth[6:]
  1188  		decoded, err := base64.StdEncoding.DecodeString(encoded)
  1189  		if err != nil {
  1190  			t.Fatal(err)
  1191  		}
  1192  		s := string(decoded)
  1193  		if expected != s {
  1194  			t.Errorf("Invalid Authorization header. Got %q, wanted %q", s, expected)
  1195  		}
  1196  	} else {
  1197  		t.Errorf("Invalid auth %q", auth)
  1198  	}
  1199  
  1200  }
  1201  
  1202  func TestStripPasswordFromError(t *testing.T) {
  1203  	client := &Client{Transport: &recordingTransport{}}
  1204  	testCases := []struct {
  1205  		desc string
  1206  		in   string
  1207  		out  string
  1208  	}{
  1209  		{
  1210  			desc: "Strip password from error message",
  1211  			in:   "http://user:password@dummy.faketld/",
  1212  			out:  `Get "http://user:***@dummy.faketld/": dummy impl`,
  1213  		},
  1214  		{
  1215  			desc: "Don't Strip password from domain name",
  1216  			in:   "http://user:password@password.faketld/",
  1217  			out:  `Get "http://user:***@password.faketld/": dummy impl`,
  1218  		},
  1219  		{
  1220  			desc: "Don't Strip password from path",
  1221  			in:   "http://user:password@dummy.faketld/password",
  1222  			out:  `Get "http://user:***@dummy.faketld/password": dummy impl`,
  1223  		},
  1224  		{
  1225  			desc: "Strip escaped password",
  1226  			in:   "http://user:pa%2Fssword@dummy.faketld/",
  1227  			out:  `Get "http://user:***@dummy.faketld/": dummy impl`,
  1228  		},
  1229  	}
  1230  	for _, tC := range testCases {
  1231  		t.Run(tC.desc, func(t *testing.T) {
  1232  			_, err := client.Get(tC.in)
  1233  			if err.Error() != tC.out {
  1234  				t.Errorf("Unexpected output for %q: expected %q, actual %q",
  1235  					tC.in, tC.out, err.Error())
  1236  			}
  1237  		})
  1238  	}
  1239  }
  1240  
  1241  func TestClientTimeout(t *testing.T) { runSynctest(t, testClientTimeout, http3SkippedMode) }
  1242  func testClientTimeout(t *testing.T, mode testMode) {
  1243  	sawSlow := false
  1244  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1245  		switch r.URL.Path {
  1246  		case "/":
  1247  			Redirect(w, r, "/slow", StatusFound)
  1248  		case "/slow":
  1249  			w.WriteHeader(200)
  1250  			w.Write([]byte("hello"))
  1251  			NewResponseController(w).Flush()
  1252  			sawSlow = true
  1253  			<-r.Context().Done()
  1254  		}
  1255  	}))
  1256  
  1257  	// Trigger a timeout after reading part of the response body.
  1258  	timeout := 10 * time.Second
  1259  	cst.c.Timeout = timeout
  1260  
  1261  	res, err := cst.c.Get(cst.ts.URL + "/")
  1262  	if err != nil {
  1263  		t.Fatal(err)
  1264  	}
  1265  
  1266  	synctest.Wait()
  1267  	if !sawSlow {
  1268  		t.Fatal("handler never got /slow request, but client returned response")
  1269  	}
  1270  
  1271  	_, err = io.ReadAll(res.Body)
  1272  	res.Body.Close()
  1273  
  1274  	if err == nil {
  1275  		t.Fatal("expected error from ReadAll")
  1276  	}
  1277  	ne, ok := err.(net.Error)
  1278  	if !ok {
  1279  		t.Errorf("error value from ReadAll was %T; expected some net.Error", err)
  1280  	} else if !ne.Timeout() {
  1281  		t.Errorf("net.Error.Timeout = false; want true")
  1282  	}
  1283  	if !errors.Is(err, context.DeadlineExceeded) {
  1284  		t.Errorf("ReadAll error = %q; expected some context.DeadlineExceeded", err)
  1285  	}
  1286  	if got := ne.Error(); !strings.Contains(got, "(Client.Timeout") {
  1287  		t.Errorf("error string = %q; missing timeout substring", got)
  1288  	}
  1289  }
  1290  
  1291  // Client.Timeout firing before getting to the body
  1292  func TestClientTimeout_Headers(t *testing.T) {
  1293  	// Leaves lingering goroutine that fails the test when tested with -race
  1294  	// flag for HTTP/3. The lingering goroutine will eventually exit, which can
  1295  	// make this test deceptively pass when ran together with many other tests.
  1296  	runSynctest(t, testClientTimeout_Headers, http3SkippedMode)
  1297  }
  1298  func testClientTimeout_Headers(t *testing.T, mode testMode) {
  1299  	donec := make(chan bool, 1)
  1300  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1301  		<-donec
  1302  	}), optQuietLog)
  1303  	// Note that we use a channel send here and not a close.
  1304  	// The race detector doesn't know that we're waiting for a timeout
  1305  	// and thinks that the waitgroup inside httptest.Server is added to concurrently
  1306  	// with us closing it. If we timed out immediately, we could close the testserver
  1307  	// before we entered the handler. We're not timing out immediately and there's
  1308  	// no way we would be done before we entered the handler, but the race detector
  1309  	// doesn't know this, so synchronize explicitly.
  1310  	defer func() { donec <- true }()
  1311  
  1312  	cst.c.Timeout = 5 * time.Millisecond
  1313  	res, err := cst.c.Get(cst.ts.URL)
  1314  	if err == nil {
  1315  		res.Body.Close()
  1316  		t.Fatal("got response from Get; expected error")
  1317  	}
  1318  	if _, ok := err.(*url.Error); !ok {
  1319  		t.Fatalf("Got error of type %T; want *url.Error", err)
  1320  	}
  1321  	ne, ok := err.(net.Error)
  1322  	if !ok {
  1323  		t.Fatalf("Got error of type %T; want some net.Error", err)
  1324  	}
  1325  	if !ne.Timeout() {
  1326  		t.Error("net.Error.Timeout = false; want true")
  1327  	}
  1328  	if !errors.Is(err, context.DeadlineExceeded) {
  1329  		t.Errorf("ReadAll error = %q; expected some context.DeadlineExceeded", err)
  1330  	}
  1331  	if got := ne.Error(); !strings.Contains(got, "Client.Timeout exceeded") {
  1332  		if runtime.GOOS == "windows" && runtime.GOARCH == "arm64" {
  1333  			testenv.SkipFlaky(t, 43120)
  1334  		}
  1335  		t.Errorf("error string = %q; missing timeout substring", got)
  1336  	}
  1337  }
  1338  
  1339  // Issue 16094: if Client.Timeout is set but not hit, a Timeout error shouldn't be
  1340  // returned.
  1341  func TestClientTimeoutCancel(t *testing.T) { runSynctest(t, testClientTimeoutCancel, http3SkippedMode) }
  1342  func testClientTimeoutCancel(t *testing.T, mode testMode) {
  1343  	testDone := make(chan struct{})
  1344  	ctx, cancel := context.WithCancel(context.Background())
  1345  
  1346  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1347  		w.(Flusher).Flush()
  1348  		<-testDone
  1349  	}))
  1350  	defer close(testDone)
  1351  
  1352  	cst.c.Timeout = 1 * time.Hour
  1353  	req, _ := NewRequest("GET", cst.ts.URL, nil)
  1354  	req.Cancel = ctx.Done()
  1355  	res, err := cst.c.Do(req)
  1356  	if err != nil {
  1357  		t.Fatal(err)
  1358  	}
  1359  	cancel()
  1360  	_, err = io.Copy(io.Discard, res.Body)
  1361  	if err != ExportErrRequestCanceled {
  1362  		t.Fatalf("error = %v; want errRequestCanceled", err)
  1363  	}
  1364  }
  1365  
  1366  // Issue 49366: if Client.Timeout is set but not hit, no error should be returned.
  1367  func TestClientTimeoutDoesNotExpire(t *testing.T) { runSynctest(t, testClientTimeoutDoesNotExpire) }
  1368  func testClientTimeoutDoesNotExpire(t *testing.T, mode testMode) {
  1369  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1370  		w.Write([]byte("body"))
  1371  	}))
  1372  
  1373  	cst.c.Timeout = 1 * time.Hour
  1374  	req, _ := NewRequest("GET", cst.ts.URL, nil)
  1375  	res, err := cst.c.Do(req)
  1376  	if err != nil {
  1377  		t.Fatal(err)
  1378  	}
  1379  	if _, err = io.Copy(io.Discard, res.Body); err != nil {
  1380  		t.Fatalf("io.Copy(io.Discard, res.Body) = %v, want nil", err)
  1381  	}
  1382  	if err = res.Body.Close(); err != nil {
  1383  		t.Fatalf("res.Body.Close() = %v, want nil", err)
  1384  	}
  1385  }
  1386  
  1387  func TestClientRedirectEatsBody_h1(t *testing.T) { runSynctest(t, testClientRedirectEatsBody) }
  1388  func testClientRedirectEatsBody(t *testing.T, mode testMode) {
  1389  	saw := make(chan string, 2)
  1390  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1391  		saw <- r.RemoteAddr
  1392  		if r.URL.Path == "/" {
  1393  			Redirect(w, r, "/foo", StatusFound) // which includes a body
  1394  		}
  1395  	}))
  1396  
  1397  	res, err := cst.c.Get(cst.ts.URL)
  1398  	if err != nil {
  1399  		t.Fatal(err)
  1400  	}
  1401  	_, err = io.ReadAll(res.Body)
  1402  	res.Body.Close()
  1403  	if err != nil {
  1404  		t.Fatal(err)
  1405  	}
  1406  
  1407  	var first string
  1408  	select {
  1409  	case first = <-saw:
  1410  	default:
  1411  		t.Fatal("server didn't see a request")
  1412  	}
  1413  
  1414  	var second string
  1415  	select {
  1416  	case second = <-saw:
  1417  	default:
  1418  		t.Fatal("server didn't see a second request")
  1419  	}
  1420  
  1421  	if first != second {
  1422  		t.Fatal("server saw different client ports before & after the redirect")
  1423  	}
  1424  }
  1425  
  1426  // eofReaderFunc is an io.Reader that runs itself, and then returns io.EOF.
  1427  type eofReaderFunc func()
  1428  
  1429  func (f eofReaderFunc) Read(p []byte) (n int, err error) {
  1430  	f()
  1431  	return 0, io.EOF
  1432  }
  1433  
  1434  func TestReferer(t *testing.T) {
  1435  	tests := []struct {
  1436  		lastReq, newReq, explicitRef string // from -> to URLs, explicitly set Referer value
  1437  		want                         string
  1438  	}{
  1439  		// don't send user:
  1440  		{lastReq: "http://gopher@test.com", newReq: "http://link.com", want: "http://test.com"},
  1441  		{lastReq: "https://gopher@test.com", newReq: "https://link.com", want: "https://test.com"},
  1442  
  1443  		// don't send a user and password:
  1444  		{lastReq: "http://gopher:go@test.com", newReq: "http://link.com", want: "http://test.com"},
  1445  		{lastReq: "https://gopher:go@test.com", newReq: "https://link.com", want: "https://test.com"},
  1446  
  1447  		// nothing to do:
  1448  		{lastReq: "http://test.com", newReq: "http://link.com", want: "http://test.com"},
  1449  		{lastReq: "https://test.com", newReq: "https://link.com", want: "https://test.com"},
  1450  
  1451  		// https to http doesn't send a referer:
  1452  		{lastReq: "https://test.com", newReq: "http://link.com", want: ""},
  1453  		{lastReq: "https://gopher:go@test.com", newReq: "http://link.com", want: ""},
  1454  
  1455  		// https to http should remove an existing referer:
  1456  		{lastReq: "https://test.com", newReq: "http://link.com", explicitRef: "https://foo.com", want: ""},
  1457  		{lastReq: "https://gopher:go@test.com", newReq: "http://link.com", explicitRef: "https://foo.com", want: ""},
  1458  
  1459  		// don't override an existing referer:
  1460  		{lastReq: "https://test.com", newReq: "https://link.com", explicitRef: "https://foo.com", want: "https://foo.com"},
  1461  		{lastReq: "https://gopher:go@test.com", newReq: "https://link.com", explicitRef: "https://foo.com", want: "https://foo.com"},
  1462  	}
  1463  	for _, tt := range tests {
  1464  		l, err := url.Parse(tt.lastReq)
  1465  		if err != nil {
  1466  			t.Fatal(err)
  1467  		}
  1468  		n, err := url.Parse(tt.newReq)
  1469  		if err != nil {
  1470  			t.Fatal(err)
  1471  		}
  1472  		r := ExportRefererForURL(l, n, tt.explicitRef)
  1473  		if r != tt.want {
  1474  			t.Errorf("refererForURL(%q, %q) = %q; want %q", tt.lastReq, tt.newReq, r, tt.want)
  1475  		}
  1476  	}
  1477  }
  1478  
  1479  // issue15577Tripper returns a Response with a redirect response
  1480  // header and doesn't populate its Response.Request field.
  1481  type issue15577Tripper struct{}
  1482  
  1483  func (issue15577Tripper) RoundTrip(*Request) (*Response, error) {
  1484  	resp := &Response{
  1485  		StatusCode: 303,
  1486  		Header:     map[string][]string{"Location": {"http://www.example.com/"}},
  1487  		Body:       io.NopCloser(strings.NewReader("")),
  1488  	}
  1489  	return resp, nil
  1490  }
  1491  
  1492  // Issue 15577: don't assume the roundtripper's response populates its Request field.
  1493  func TestClientRedirectResponseWithoutRequest(t *testing.T) {
  1494  	c := &Client{
  1495  		CheckRedirect: func(*Request, []*Request) error { return fmt.Errorf("no redirects!") },
  1496  		Transport:     issue15577Tripper{},
  1497  	}
  1498  	// Check that this doesn't crash:
  1499  	c.Get("http://dummy.tld")
  1500  }
  1501  
  1502  // Issue 4800: copy (some) headers when Client follows a redirect.
  1503  // Issue 35104: Since both URLs have the same host (localhost)
  1504  // but different ports, sensitive headers like Cookie and Authorization
  1505  // are preserved.
  1506  func TestClientCopyHeadersOnRedirect(t *testing.T) {
  1507  	runSynctest(t, testClientCopyHeadersOnRedirect, http3SkippedMode)
  1508  }
  1509  func testClientCopyHeadersOnRedirect(t *testing.T, mode testMode) {
  1510  	const (
  1511  		ua   = "some-agent/1.2"
  1512  		xfoo = "foo-val"
  1513  	)
  1514  	var (
  1515  		targetHost   = "target.example.com"
  1516  		redirectHost = "example.com"
  1517  		targetURL    = mode.Scheme() + "://" + targetHost + "/"
  1518  		redirectURL  = mode.Scheme() + "://" + redirectHost + "/"
  1519  	)
  1520  	mux := NewServeMux()
  1521  	mux.Handle(targetHost+"/", HandlerFunc(func(w ResponseWriter, r *Request) {
  1522  		want := Header{
  1523  			"User-Agent":      []string{ua},
  1524  			"X-Foo":           []string{xfoo},
  1525  			"Referer":         []string{redirectURL},
  1526  			"Accept-Encoding": []string{"gzip"},
  1527  			"Cookie":          []string{"foo=bar"},
  1528  			"Authorization":   []string{"secretpassword"},
  1529  		}
  1530  		if !reflect.DeepEqual(r.Header, want) {
  1531  			t.Errorf("Request.Header = %#v; want %#v", r.Header, want)
  1532  		}
  1533  		if t.Failed() {
  1534  			w.Header().Set("Result", "got errors")
  1535  		} else {
  1536  			w.Header().Set("Result", "ok")
  1537  		}
  1538  	}))
  1539  	mux.Handle(redirectHost+"/", HandlerFunc(func(w ResponseWriter, r *Request) {
  1540  		Redirect(w, r, targetURL, StatusFound)
  1541  	}))
  1542  	ts := newClientServerTest(t, mode, mux).ts
  1543  
  1544  	c := ts.Client()
  1545  	c.CheckRedirect = func(r *Request, via []*Request) error {
  1546  		want := Header{
  1547  			"User-Agent":    []string{ua},
  1548  			"X-Foo":         []string{xfoo},
  1549  			"Referer":       []string{redirectURL},
  1550  			"Cookie":        []string{"foo=bar"},
  1551  			"Authorization": []string{"secretpassword"},
  1552  		}
  1553  		if !reflect.DeepEqual(r.Header, want) {
  1554  			t.Errorf("CheckRedirect Request.Header = %#v; want %#v", r.Header, want)
  1555  		}
  1556  		return nil
  1557  	}
  1558  
  1559  	req, _ := NewRequest("GET", redirectURL, nil)
  1560  	req.Header.Add("User-Agent", ua)
  1561  	req.Header.Add("X-Foo", xfoo)
  1562  	req.Header.Add("Cookie", "foo=bar")
  1563  	req.Header.Add("Authorization", "secretpassword")
  1564  	res, err := c.Do(req)
  1565  	if err != nil {
  1566  		t.Fatal(err)
  1567  	}
  1568  	defer res.Body.Close()
  1569  	if res.StatusCode != 200 {
  1570  		t.Fatal(res.Status)
  1571  	}
  1572  	if got := res.Header.Get("Result"); got != "ok" {
  1573  		t.Errorf("result = %q; want ok", got)
  1574  	}
  1575  }
  1576  
  1577  // Issue #70530: Once we strip a header on a redirect to a different host,
  1578  // the header should stay stripped across any further redirects.
  1579  func TestClientStripHeadersOnRepeatedRedirect(t *testing.T) {
  1580  	runSynctest(t, testClientStripHeadersOnRepeatedRedirect, http3SkippedMode)
  1581  }
  1582  func testClientStripHeadersOnRepeatedRedirect(t *testing.T, mode testMode) {
  1583  	var proto string
  1584  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1585  		if r.Host+r.URL.Path != "a.example.com/" {
  1586  			if h := r.Header.Get("Authorization"); h != "" {
  1587  				t.Errorf("on request to %v%v, Authorization=%q, want no header", r.Host, r.URL.Path, h)
  1588  			} else if h := r.Header.Get("Proxy-Authorization"); h != "" {
  1589  				t.Errorf("on request to %v%v, Proxy-Authorization=%q, want no header", r.Host, r.URL.Path, h)
  1590  			}
  1591  		}
  1592  		// Follow a chain of redirects from a to b and back to a.
  1593  		// The Authorization header is stripped on the first redirect to b,
  1594  		// and stays stripped even if we're sent back to a.
  1595  		switch r.Host + r.URL.Path {
  1596  		case "a.example.com/":
  1597  			Redirect(w, r, proto+"://b.example.com/", StatusFound)
  1598  		case "b.example.com/":
  1599  			Redirect(w, r, proto+"://b.example.com/redirect", StatusFound)
  1600  		case "b.example.com/redirect":
  1601  			Redirect(w, r, proto+"://a.example.com/redirect", StatusFound)
  1602  		case "a.example.com/redirect":
  1603  			w.Header().Set("X-Done", "true")
  1604  		default:
  1605  			t.Errorf("unexpected request to %v", r.URL)
  1606  		}
  1607  	})).ts
  1608  	proto, _, _ = strings.Cut(ts.URL, ":")
  1609  
  1610  	c := ts.Client()
  1611  	c.Transport.(*Transport).Dial = func(_ string, _ string) (net.Conn, error) {
  1612  		return net.Dial("tcp", ts.Listener.Addr().String())
  1613  	}
  1614  
  1615  	req, _ := NewRequest("GET", proto+"://a.example.com/", nil)
  1616  	req.Header.Add("Cookie", "foo=bar")
  1617  	req.Header.Add("Authorization", "secretpassword")
  1618  	req.Header.Add("Proxy-Authorization", "secretpassword")
  1619  	res, err := c.Do(req)
  1620  	if err != nil {
  1621  		t.Fatal(err)
  1622  	}
  1623  	defer res.Body.Close()
  1624  	if res.Header.Get("X-Done") != "true" {
  1625  		t.Fatalf("response missing expected header: X-Done=true")
  1626  	}
  1627  }
  1628  
  1629  func TestClientStripHeadersOnPostToGetRedirect(t *testing.T) {
  1630  	runSynctest(t, testClientStripHeadersOnPostToGetRedirect)
  1631  }
  1632  func testClientStripHeadersOnPostToGetRedirect(t *testing.T, mode testMode) {
  1633  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1634  		if r.Method == "POST" {
  1635  			Redirect(w, r, "/redirected", StatusFound)
  1636  			return
  1637  		} else if r.Method != "GET" {
  1638  			t.Errorf("unexpected request method: %v", r.Method)
  1639  			return
  1640  		}
  1641  		for key, val := range r.Header {
  1642  			if strings.HasPrefix(key, "Content-") {
  1643  				t.Errorf("unexpected request body header after redirect: %v: %v", key, val)
  1644  			}
  1645  		}
  1646  	})).ts
  1647  
  1648  	c := ts.Client()
  1649  
  1650  	req, _ := NewRequest("POST", ts.URL, strings.NewReader("hello world"))
  1651  	req.Header.Set("Content-Encoding", "a")
  1652  	req.Header.Set("Content-Language", "b")
  1653  	req.Header.Set("Content-Length", "c")
  1654  	req.Header.Set("Content-Type", "d")
  1655  	res, err := c.Do(req)
  1656  	if err != nil {
  1657  		t.Fatal(err)
  1658  	}
  1659  	defer res.Body.Close()
  1660  }
  1661  
  1662  // Issue 22233: copy host when Client follows a relative redirect.
  1663  func TestClientCopyHostOnRedirect(t *testing.T) { runSynctest(t, testClientCopyHostOnRedirect) }
  1664  func testClientCopyHostOnRedirect(t *testing.T, mode testMode) {
  1665  	// Virtual hostname: should not receive any request.
  1666  	virtual := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1667  		t.Errorf("Virtual host received request %v", r.URL)
  1668  		w.WriteHeader(403)
  1669  		io.WriteString(w, "should not see this response")
  1670  	})).ts
  1671  	defer virtual.Close()
  1672  	virtualHost := strings.TrimPrefix(virtual.URL, "http://")
  1673  	virtualHost = strings.TrimPrefix(virtualHost, "https://")
  1674  	t.Logf("Virtual host is %v", virtualHost)
  1675  
  1676  	// Actual hostname: should not receive any request.
  1677  	const wantBody = "response body"
  1678  	var tsURL string
  1679  	var tsHost string
  1680  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1681  		switch r.URL.Path {
  1682  		case "/":
  1683  			// Relative redirect.
  1684  			if r.Host != virtualHost {
  1685  				t.Errorf("Serving /: Request.Host = %#v; want %#v", r.Host, virtualHost)
  1686  				w.WriteHeader(404)
  1687  				return
  1688  			}
  1689  			w.Header().Set("Location", "/hop")
  1690  			w.WriteHeader(302)
  1691  		case "/hop":
  1692  			// Absolute redirect.
  1693  			if r.Host != virtualHost {
  1694  				t.Errorf("Serving /hop: Request.Host = %#v; want %#v", r.Host, virtualHost)
  1695  				w.WriteHeader(404)
  1696  				return
  1697  			}
  1698  			w.Header().Set("Location", tsURL+"/final")
  1699  			w.WriteHeader(302)
  1700  		case "/final":
  1701  			if r.Host != tsHost {
  1702  				t.Errorf("Serving /final: Request.Host = %#v; want %#v", r.Host, tsHost)
  1703  				w.WriteHeader(404)
  1704  				return
  1705  			}
  1706  			w.WriteHeader(200)
  1707  			io.WriteString(w, wantBody)
  1708  		default:
  1709  			t.Errorf("Serving unexpected path %q", r.URL.Path)
  1710  			w.WriteHeader(404)
  1711  		}
  1712  	})).ts
  1713  	tsURL = ts.URL
  1714  	tsHost = strings.TrimPrefix(ts.URL, "http://")
  1715  	tsHost = strings.TrimPrefix(tsHost, "https://")
  1716  	t.Logf("Server host is %v", tsHost)
  1717  
  1718  	c := ts.Client()
  1719  	req, _ := NewRequest("GET", ts.URL, nil)
  1720  	req.Host = virtualHost
  1721  	resp, err := c.Do(req)
  1722  	if err != nil {
  1723  		t.Fatal(err)
  1724  	}
  1725  	defer resp.Body.Close()
  1726  	if resp.StatusCode != 200 {
  1727  		t.Fatal(resp.Status)
  1728  	}
  1729  	if got, err := io.ReadAll(resp.Body); err != nil || string(got) != wantBody {
  1730  		t.Errorf("body = %q; want %q", got, wantBody)
  1731  	}
  1732  }
  1733  
  1734  // Issue 17494: cookies should be altered when Client follows redirects.
  1735  func TestClientAltersCookiesOnRedirect(t *testing.T) {
  1736  	runSynctest(t, testClientAltersCookiesOnRedirect)
  1737  }
  1738  func testClientAltersCookiesOnRedirect(t *testing.T, mode testMode) {
  1739  	cookieMap := func(cs []*Cookie) map[string][]string {
  1740  		m := make(map[string][]string)
  1741  		for _, c := range cs {
  1742  			m[c.Name] = append(m[c.Name], c.Value)
  1743  		}
  1744  		return m
  1745  	}
  1746  
  1747  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1748  		var want map[string][]string
  1749  		got := cookieMap(r.Cookies())
  1750  
  1751  		c, _ := r.Cookie("Cycle")
  1752  		switch c.Value {
  1753  		case "0":
  1754  			want = map[string][]string{
  1755  				"Cookie1": {"OldValue1a", "OldValue1b"},
  1756  				"Cookie2": {"OldValue2"},
  1757  				"Cookie3": {"OldValue3a", "OldValue3b"},
  1758  				"Cookie4": {"OldValue4"},
  1759  				"Cycle":   {"0"},
  1760  			}
  1761  			SetCookie(w, &Cookie{Name: "Cycle", Value: "1", Path: "/"})
  1762  			SetCookie(w, &Cookie{Name: "Cookie2", Path: "/", MaxAge: -1}) // Delete cookie from Header
  1763  			Redirect(w, r, "/", StatusFound)
  1764  		case "1":
  1765  			want = map[string][]string{
  1766  				"Cookie1": {"OldValue1a", "OldValue1b"},
  1767  				"Cookie3": {"OldValue3a", "OldValue3b"},
  1768  				"Cookie4": {"OldValue4"},
  1769  				"Cycle":   {"1"},
  1770  			}
  1771  			SetCookie(w, &Cookie{Name: "Cycle", Value: "2", Path: "/"})
  1772  			SetCookie(w, &Cookie{Name: "Cookie3", Value: "NewValue3", Path: "/"}) // Modify cookie in Header
  1773  			SetCookie(w, &Cookie{Name: "Cookie4", Value: "NewValue4", Path: "/"}) // Modify cookie in Jar
  1774  			Redirect(w, r, "/", StatusFound)
  1775  		case "2":
  1776  			want = map[string][]string{
  1777  				"Cookie1": {"OldValue1a", "OldValue1b"},
  1778  				"Cookie3": {"NewValue3"},
  1779  				"Cookie4": {"NewValue4"},
  1780  				"Cycle":   {"2"},
  1781  			}
  1782  			SetCookie(w, &Cookie{Name: "Cycle", Value: "3", Path: "/"})
  1783  			SetCookie(w, &Cookie{Name: "Cookie5", Value: "NewValue5", Path: "/"}) // Insert cookie into Jar
  1784  			Redirect(w, r, "/", StatusFound)
  1785  		case "3":
  1786  			want = map[string][]string{
  1787  				"Cookie1": {"OldValue1a", "OldValue1b"},
  1788  				"Cookie3": {"NewValue3"},
  1789  				"Cookie4": {"NewValue4"},
  1790  				"Cookie5": {"NewValue5"},
  1791  				"Cycle":   {"3"},
  1792  			}
  1793  			// Don't redirect to ensure the loop ends.
  1794  		default:
  1795  			t.Errorf("unexpected redirect cycle")
  1796  			return
  1797  		}
  1798  
  1799  		if !reflect.DeepEqual(got, want) {
  1800  			t.Errorf("redirect %s, Cookie = %v, want %v", c.Value, got, want)
  1801  		}
  1802  	})).ts
  1803  
  1804  	jar, _ := cookiejar.New(nil)
  1805  	c := ts.Client()
  1806  	c.Jar = jar
  1807  
  1808  	u, _ := url.Parse(ts.URL)
  1809  	req, _ := NewRequest("GET", ts.URL, nil)
  1810  	req.AddCookie(&Cookie{Name: "Cookie1", Value: "OldValue1a"})
  1811  	req.AddCookie(&Cookie{Name: "Cookie1", Value: "OldValue1b"})
  1812  	req.AddCookie(&Cookie{Name: "Cookie2", Value: "OldValue2"})
  1813  	req.AddCookie(&Cookie{Name: "Cookie3", Value: "OldValue3a"})
  1814  	req.AddCookie(&Cookie{Name: "Cookie3", Value: "OldValue3b"})
  1815  	jar.SetCookies(u, []*Cookie{{Name: "Cookie4", Value: "OldValue4", Path: "/"}})
  1816  	jar.SetCookies(u, []*Cookie{{Name: "Cycle", Value: "0", Path: "/"}})
  1817  	res, err := c.Do(req)
  1818  	if err != nil {
  1819  		t.Fatal(err)
  1820  	}
  1821  	defer res.Body.Close()
  1822  	if res.StatusCode != 200 {
  1823  		t.Fatal(res.Status)
  1824  	}
  1825  }
  1826  
  1827  // Part of Issue 4800
  1828  func TestShouldCopyHeaderOnRedirect(t *testing.T) {
  1829  	tests := []struct {
  1830  		initialURL string
  1831  		destURL    string
  1832  		want       bool
  1833  	}{
  1834  		// Sensitive headers:
  1835  		{"http://foo.com/", "http://bar.com/", false},
  1836  		{"http://foo.com/", "http://bar.com/", false},
  1837  		{"http://foo.com/", "http://bar.com/", false},
  1838  		{"http://foo.com/", "https://foo.com/", true},
  1839  		{"http://foo.com:1234/", "http://foo.com:4321/", true},
  1840  		{"http://foo.com/", "http://bar.com/", false},
  1841  		{"http://foo.com/", "http://[::1%25.foo.com]/", false},
  1842  
  1843  		// But subdomains should work:
  1844  		{"http://foo.com/", "http://foo.com/", true},
  1845  		{"http://foo.com/", "http://sub.foo.com/", true},
  1846  		{"http://foo.com/", "http://notfoo.com/", false},
  1847  		{"http://foo.com/", "https://foo.com/", true},
  1848  		{"http://foo.com:80/", "http://foo.com/", true},
  1849  		{"http://foo.com:80/", "http://sub.foo.com/", true},
  1850  		{"http://foo.com:443/", "https://foo.com/", true},
  1851  		{"http://foo.com:443/", "https://sub.foo.com/", true},
  1852  		{"http://foo.com:1234/", "http://foo.com/", true},
  1853  
  1854  		{"http://foo.com/", "http://foo.com/", true},
  1855  		{"http://foo.com/", "http://sub.foo.com/", true},
  1856  		{"http://foo.com/", "http://notfoo.com/", false},
  1857  		{"http://foo.com/", "https://foo.com/", true},
  1858  		{"http://foo.com:80/", "http://foo.com/", true},
  1859  		{"http://foo.com:80/", "http://sub.foo.com/", true},
  1860  		{"http://foo.com:443/", "https://foo.com/", true},
  1861  		{"http://foo.com:443/", "https://sub.foo.com/", true},
  1862  		{"http://foo.com:1234/", "http://foo.com/", true},
  1863  
  1864  		{"http://foobar.com/", "http://fooBAR.com/", true},
  1865  
  1866  		{"http://example.com/", "http://evil。example.com/", false},
  1867  		{"http://example.com/", "http://ｅxample.com/", false},
  1868  		{"http://süb.example.com/", "http://sÜb.example.com/", false},
  1869  	}
  1870  	for i, tt := range tests {
  1871  		u0, err := url.Parse(tt.initialURL)
  1872  		if err != nil {
  1873  			t.Errorf("%d. initial URL %q parse error: %v", i, tt.initialURL, err)
  1874  			continue
  1875  		}
  1876  		u1, err := url.Parse(tt.destURL)
  1877  		if err != nil {
  1878  			t.Errorf("%d. dest URL %q parse error: %v", i, tt.destURL, err)
  1879  			continue
  1880  		}
  1881  		got := Export_shouldCopyHeaderOnRedirect(u0, u1)
  1882  		if got != tt.want {
  1883  			t.Errorf("%d. shouldCopyHeaderOnRedirect(%q => %q) = %v; want %v",
  1884  				i, tt.initialURL, tt.destURL, got, tt.want)
  1885  		}
  1886  	}
  1887  }
  1888  
  1889  func TestClientRedirectTypes(t *testing.T) { runSynctest(t, testClientRedirectTypes) }
  1890  func testClientRedirectTypes(t *testing.T, mode testMode) {
  1891  	tests := [...]struct {
  1892  		method       string
  1893  		serverStatus int
  1894  		wantMethod   string // desired subsequent client method
  1895  	}{
  1896  		0: {method: "POST", serverStatus: 301, wantMethod: "GET"},
  1897  		1: {method: "POST", serverStatus: 302, wantMethod: "GET"},
  1898  		2: {method: "POST", serverStatus: 303, wantMethod: "GET"},
  1899  		3: {method: "POST", serverStatus: 307, wantMethod: "POST"},
  1900  		4: {method: "POST", serverStatus: 308, wantMethod: "POST"},
  1901  
  1902  		5: {method: "HEAD", serverStatus: 301, wantMethod: "HEAD"},
  1903  		6: {method: "HEAD", serverStatus: 302, wantMethod: "HEAD"},
  1904  		7: {method: "HEAD", serverStatus: 303, wantMethod: "HEAD"},
  1905  		8: {method: "HEAD", serverStatus: 307, wantMethod: "HEAD"},
  1906  		9: {method: "HEAD", serverStatus: 308, wantMethod: "HEAD"},
  1907  
  1908  		10: {method: "GET", serverStatus: 301, wantMethod: "GET"},
  1909  		11: {method: "GET", serverStatus: 302, wantMethod: "GET"},
  1910  		12: {method: "GET", serverStatus: 303, wantMethod: "GET"},
  1911  		13: {method: "GET", serverStatus: 307, wantMethod: "GET"},
  1912  		14: {method: "GET", serverStatus: 308, wantMethod: "GET"},
  1913  
  1914  		15: {method: "DELETE", serverStatus: 301, wantMethod: "GET"},
  1915  		16: {method: "DELETE", serverStatus: 302, wantMethod: "GET"},
  1916  		17: {method: "DELETE", serverStatus: 303, wantMethod: "GET"},
  1917  		18: {method: "DELETE", serverStatus: 307, wantMethod: "DELETE"},
  1918  		19: {method: "DELETE", serverStatus: 308, wantMethod: "DELETE"},
  1919  
  1920  		20: {method: "PUT", serverStatus: 301, wantMethod: "GET"},
  1921  		21: {method: "PUT", serverStatus: 302, wantMethod: "GET"},
  1922  		22: {method: "PUT", serverStatus: 303, wantMethod: "GET"},
  1923  		23: {method: "PUT", serverStatus: 307, wantMethod: "PUT"},
  1924  		24: {method: "PUT", serverStatus: 308, wantMethod: "PUT"},
  1925  
  1926  		25: {method: "MADEUPMETHOD", serverStatus: 301, wantMethod: "GET"},
  1927  		26: {method: "MADEUPMETHOD", serverStatus: 302, wantMethod: "GET"},
  1928  		27: {method: "MADEUPMETHOD", serverStatus: 303, wantMethod: "GET"},
  1929  		28: {method: "MADEUPMETHOD", serverStatus: 307, wantMethod: "MADEUPMETHOD"},
  1930  		29: {method: "MADEUPMETHOD", serverStatus: 308, wantMethod: "MADEUPMETHOD"},
  1931  	}
  1932  
  1933  	handlerc := make(chan HandlerFunc, 1)
  1934  
  1935  	ts := newClientServerTest(t, mode, HandlerFunc(func(rw ResponseWriter, req *Request) {
  1936  		h := <-handlerc
  1937  		h(rw, req)
  1938  	})).ts
  1939  
  1940  	c := ts.Client()
  1941  	for i, tt := range tests {
  1942  		handlerc <- func(w ResponseWriter, r *Request) {
  1943  			w.Header().Set("Location", ts.URL)
  1944  			w.WriteHeader(tt.serverStatus)
  1945  		}
  1946  
  1947  		req, err := NewRequest(tt.method, ts.URL, nil)
  1948  		if err != nil {
  1949  			t.Errorf("#%d: NewRequest: %v", i, err)
  1950  			continue
  1951  		}
  1952  
  1953  		c.CheckRedirect = func(req *Request, via []*Request) error {
  1954  			if got, want := req.Method, tt.wantMethod; got != want {
  1955  				return fmt.Errorf("#%d: got next method %q; want %q", i, got, want)
  1956  			}
  1957  			handlerc <- func(rw ResponseWriter, req *Request) {
  1958  				// TODO: Check that the body is valid when we do 307 and 308 support
  1959  			}
  1960  			return nil
  1961  		}
  1962  
  1963  		res, err := c.Do(req)
  1964  		if err != nil {
  1965  			t.Errorf("#%d: Response: %v", i, err)
  1966  			continue
  1967  		}
  1968  
  1969  		res.Body.Close()
  1970  	}
  1971  }
  1972  
  1973  // issue18239Body is an io.ReadCloser for TestTransportBodyReadError.
  1974  // Its Read returns readErr and increments *readCalls atomically.
  1975  // Its Close returns nil and increments *closeCalls atomically.
  1976  type issue18239Body struct {
  1977  	readCalls  *int32
  1978  	closeCalls *int32
  1979  	readErr    error
  1980  }
  1981  
  1982  func (b issue18239Body) Read([]byte) (int, error) {
  1983  	atomic.AddInt32(b.readCalls, 1)
  1984  	return 0, b.readErr
  1985  }
  1986  
  1987  func (b issue18239Body) Close() error {
  1988  	atomic.AddInt32(b.closeCalls, 1)
  1989  	return nil
  1990  }
  1991  
  1992  // Issue 18239: make sure the Transport doesn't retry requests with bodies
  1993  // if Request.GetBody is not defined.
  1994  func TestTransportBodyReadError(t *testing.T) { runSynctest(t, testTransportBodyReadError) }
  1995  func testTransportBodyReadError(t *testing.T, mode testMode) {
  1996  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1997  		if r.URL.Path == "/ping" {
  1998  			return
  1999  		}
  2000  		buf := make([]byte, 1)
  2001  		n, err := r.Body.Read(buf)
  2002  		w.Header().Set("X-Body-Read", fmt.Sprintf("%v, %v", n, err))
  2003  	})).ts
  2004  	c := ts.Client()
  2005  	tr := c.Transport.(*Transport)
  2006  
  2007  	// Do one initial successful request to create an idle TCP connection
  2008  	// for the subsequent request to reuse. (The Transport only retries
  2009  	// requests on reused connections.)
  2010  	res, err := c.Get(ts.URL + "/ping")
  2011  	if err != nil {
  2012  		t.Fatal(err)
  2013  	}
  2014  	res.Body.Close()
  2015  
  2016  	var readCallsAtomic int32
  2017  	var closeCallsAtomic int32 // atomic
  2018  	someErr := errors.New("some body read error")
  2019  	body := issue18239Body{&readCallsAtomic, &closeCallsAtomic, someErr}
  2020  
  2021  	req, err := NewRequest("POST", ts.URL, body)
  2022  	if err != nil {
  2023  		t.Fatal(err)
  2024  	}
  2025  	req = req.WithT(t)
  2026  	_, err = tr.RoundTrip(req)
  2027  	if err != someErr {
  2028  		t.Errorf("Got error: %v; want Request.Body read error: %v", err, someErr)
  2029  	}
  2030  
  2031  	// And verify that our Body wasn't used multiple times, which
  2032  	// would indicate retries. (as it buggily was during part of
  2033  	// Go 1.8's dev cycle)
  2034  	readCalls := atomic.LoadInt32(&readCallsAtomic)
  2035  	closeCalls := atomic.LoadInt32(&closeCallsAtomic)
  2036  	if readCalls != 1 {
  2037  		t.Errorf("read calls = %d; want 1", readCalls)
  2038  	}
  2039  	if closeCalls != 1 {
  2040  		t.Errorf("close calls = %d; want 1", closeCalls)
  2041  	}
  2042  }
  2043  
  2044  // Make sure the retries copies the GetBody in the request.
  2045  func TestRedirectGetBody(t *testing.T) { runSynctest(t, testRedirectGetBody) }
  2046  
  2047  func testRedirectGetBody(t *testing.T, mode testMode) {
  2048  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  2049  		b, err := io.ReadAll(r.Body)
  2050  		if err != nil {
  2051  			t.Error(err)
  2052  		}
  2053  		if err = r.Body.Close(); err != nil {
  2054  			t.Error(err)
  2055  		}
  2056  		if s := string(b); s != "hello" {
  2057  			t.Errorf("expected hello, got %s", s)
  2058  		}
  2059  		if r.URL.Path == "/first" {
  2060  			Redirect(w, r, "/second", StatusTemporaryRedirect)
  2061  			return
  2062  		}
  2063  		w.Write([]byte("world"))
  2064  	})).ts
  2065  	c := ts.Client()
  2066  	c.Transport = &roundTripperGetBody{c.Transport, t}
  2067  	req, err := NewRequest("POST", ts.URL+"/first", strings.NewReader("hello"))
  2068  	if err != nil {
  2069  		t.Fatal(err)
  2070  	}
  2071  	res, err := c.Do(req.WithT(t))
  2072  	if err != nil {
  2073  		t.Fatal(err)
  2074  	}
  2075  	b, err := io.ReadAll(res.Body)
  2076  	if err != nil {
  2077  		t.Fatal(err)
  2078  	}
  2079  	if err = res.Body.Close(); err != nil {
  2080  		t.Fatal(err)
  2081  	}
  2082  	if s := string(b); s != "world" {
  2083  		t.Fatalf("expected world, got %s", s)
  2084  	}
  2085  }
  2086  
  2087  type roundTripperGetBody struct {
  2088  	Transport RoundTripper
  2089  	t         *testing.T
  2090  }
  2091  
  2092  func (r *roundTripperGetBody) RoundTrip(req *Request) (*Response, error) {
  2093  	if req.GetBody == nil {
  2094  		r.t.Error("missing Request.GetBody")
  2095  	}
  2096  	return r.Transport.RoundTrip(req)
  2097  }
  2098  
  2099  type roundTripperWithoutCloseIdle struct{}
  2100  
  2101  func (roundTripperWithoutCloseIdle) RoundTrip(*Request) (*Response, error) { panic("unused") }
  2102  
  2103  type roundTripperWithCloseIdle func() // underlying func is CloseIdleConnections func
  2104  
  2105  func (roundTripperWithCloseIdle) RoundTrip(*Request) (*Response, error) { panic("unused") }
  2106  func (f roundTripperWithCloseIdle) CloseIdleConnections()               { f() }
  2107  
  2108  func TestClientCloseIdleConnections(t *testing.T) {
  2109  	c := &Client{Transport: roundTripperWithoutCloseIdle{}}
  2110  	c.CloseIdleConnections() // verify we don't crash at least
  2111  
  2112  	closed := false
  2113  	var tr RoundTripper = roundTripperWithCloseIdle(func() {
  2114  		closed = true
  2115  	})
  2116  	c = &Client{Transport: tr}
  2117  	c.CloseIdleConnections()
  2118  	if !closed {
  2119  		t.Error("not closed")
  2120  	}
  2121  }
  2122  
  2123  type testRoundTripper func(*Request) (*Response, error)
  2124  
  2125  func (t testRoundTripper) RoundTrip(req *Request) (*Response, error) {
  2126  	return t(req)
  2127  }
  2128  
  2129  func TestClientPropagatesTimeoutToContext(t *testing.T) {
  2130  	c := &Client{
  2131  		Timeout: 5 * time.Second,
  2132  		Transport: testRoundTripper(func(req *Request) (*Response, error) {
  2133  			ctx := req.Context()
  2134  			deadline, ok := ctx.Deadline()
  2135  			if !ok {
  2136  				t.Error("no deadline")
  2137  			} else {
  2138  				t.Logf("deadline in %v", deadline.Sub(time.Now()).Round(time.Second/10))
  2139  			}
  2140  			return nil, errors.New("not actually making a request")
  2141  		}),
  2142  	}
  2143  	c.Get("https://example.tld/")
  2144  }
  2145  
  2146  // Issue 33545: lock-in the behavior promised by Client.Do's
  2147  // docs about request cancellation vs timing out.
  2148  func TestClientDoCanceledVsTimeout(t *testing.T) { runNoSynctest(t, testClientDoCanceledVsTimeout) }
  2149  func testClientDoCanceledVsTimeout(t *testing.T, mode testMode) {
  2150  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  2151  		w.Write([]byte("Hello, World!"))
  2152  	}))
  2153  
  2154  	cases := []string{"timeout", "canceled"}
  2155  
  2156  	for _, name := range cases {
  2157  		synctest.Subtest(t, name, func(t *testing.T) {
  2158  			var ctx context.Context
  2159  			var cancel func()
  2160  			if name == "timeout" {
  2161  				ctx, cancel = context.WithTimeout(context.Background(), -time.Nanosecond)
  2162  			} else {
  2163  				ctx, cancel = context.WithCancel(context.Background())
  2164  				cancel()
  2165  			}
  2166  			defer cancel()
  2167  
  2168  			req, _ := NewRequestWithContext(ctx, "GET", cst.ts.URL, nil)
  2169  			_, err := cst.c.Do(req)
  2170  			if err == nil {
  2171  				t.Fatal("Unexpectedly got a nil error")
  2172  			}
  2173  
  2174  			ue := err.(*url.Error)
  2175  
  2176  			var wantIsTimeout bool
  2177  			var wantErr error = context.Canceled
  2178  			if name == "timeout" {
  2179  				wantErr = context.DeadlineExceeded
  2180  				wantIsTimeout = true
  2181  			}
  2182  			if g, w := ue.Timeout(), wantIsTimeout; g != w {
  2183  				t.Fatalf("url.Timeout() = %t, want %t", g, w)
  2184  			}
  2185  			if g, w := ue.Err, wantErr; g != w {
  2186  				t.Errorf("url.Error.Err = %v; want %v", g, w)
  2187  			}
  2188  			if got := errors.Is(err, context.DeadlineExceeded); got != wantIsTimeout {
  2189  				t.Errorf("errors.Is(err, context.DeadlineExceeded) = %v, want %v", got, wantIsTimeout)
  2190  			}
  2191  		})
  2192  	}
  2193  }
  2194  
  2195  type nilBodyRoundTripper struct{}
  2196  
  2197  func (nilBodyRoundTripper) RoundTrip(req *Request) (*Response, error) {
  2198  	return &Response{
  2199  		StatusCode: StatusOK,
  2200  		Status:     StatusText(StatusOK),
  2201  		Body:       nil,
  2202  		Request:    req,
  2203  	}, nil
  2204  }
  2205  
  2206  func TestClientPopulatesNilResponseBody(t *testing.T) {
  2207  	c := &Client{Transport: nilBodyRoundTripper{}}
  2208  
  2209  	resp, err := c.Get("http://localhost/anything")
  2210  	if err != nil {
  2211  		t.Fatalf("Client.Get rejected Response with nil Body: %v", err)
  2212  	}
  2213  
  2214  	if resp.Body == nil {
  2215  		t.Fatalf("Client failed to provide a non-nil Body as documented")
  2216  	}
  2217  	defer func() {
  2218  		if err := resp.Body.Close(); err != nil {
  2219  			t.Fatalf("error from Close on substitute Response.Body: %v", err)
  2220  		}
  2221  	}()
  2222  
  2223  	if b, err := io.ReadAll(resp.Body); err != nil {
  2224  		t.Errorf("read error from substitute Response.Body: %v", err)
  2225  	} else if len(b) != 0 {
  2226  		t.Errorf("substitute Response.Body was unexpectedly non-empty: %q", b)
  2227  	}
  2228  }
  2229  
  2230  // Issue 40382: Client calls Close multiple times on Request.Body.
  2231  func TestClientCallsCloseOnlyOnce(t *testing.T) { runSynctest(t, testClientCallsCloseOnlyOnce) }
  2232  func testClientCallsCloseOnlyOnce(t *testing.T, mode testMode) {
  2233  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  2234  		w.WriteHeader(StatusNoContent)
  2235  	}))
  2236  
  2237  	// Issue occurred non-deterministically: needed to occur after a successful
  2238  	// write (into TCP buffer) but before end of body.
  2239  	for i := 0; i < 50 && !t.Failed(); i++ {
  2240  		body := &issue40382Body{t: t, n: 256 << 10} // maxPostHandlerReadBytes large
  2241  		req, err := NewRequest(MethodPost, cst.ts.URL, body)
  2242  		if err != nil {
  2243  			t.Fatal(err)
  2244  		}
  2245  		resp, err := cst.tr.RoundTrip(req)
  2246  		if err != nil {
  2247  			t.Fatal(err)
  2248  		}
  2249  		resp.Body.Close()
  2250  	}
  2251  }
  2252  
  2253  // issue40382Body is an io.ReadCloser for TestClientCallsCloseOnlyOnce.
  2254  // Its Read reads n bytes before returning io.EOF.
  2255  // Its Close returns nil but fails the test if called more than once.
  2256  type issue40382Body struct {
  2257  	t                *testing.T
  2258  	n                int
  2259  	closeCallsAtomic int32
  2260  }
  2261  
  2262  func (b *issue40382Body) Read(p []byte) (int, error) {
  2263  	switch {
  2264  	case b.n == 0:
  2265  		return 0, io.EOF
  2266  	case b.n < len(p):
  2267  		p = p[:b.n]
  2268  		fallthrough
  2269  	default:
  2270  		for i := range p {
  2271  			p[i] = 'x'
  2272  		}
  2273  		b.n -= len(p)
  2274  		return len(p), nil
  2275  	}
  2276  }
  2277  
  2278  func (b *issue40382Body) Close() error {
  2279  	if atomic.AddInt32(&b.closeCallsAtomic, 1) == 2 {
  2280  		b.t.Error("Body closed more than once")
  2281  	}
  2282  	return nil
  2283  }
  2284  
  2285  func TestProbeZeroLengthBody(t *testing.T) { runSynctest(t, testProbeZeroLengthBody) }
  2286  func testProbeZeroLengthBody(t *testing.T, mode testMode) {
  2287  	reqc := make(chan struct{})
  2288  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  2289  		close(reqc)
  2290  		if _, err := io.Copy(w, r.Body); err != nil {
  2291  			t.Errorf("error copying request body: %v", err)
  2292  		}
  2293  	}))
  2294  
  2295  	bodyr, bodyw := io.Pipe()
  2296  	var gotBody string
  2297  	var wg sync.WaitGroup
  2298  	wg.Add(1)
  2299  	go func() {
  2300  		defer wg.Done()
  2301  		req, _ := NewRequest("GET", cst.ts.URL, bodyr)
  2302  		res, err := cst.c.Do(req)
  2303  		if err != nil {
  2304  			t.Error(err)
  2305  			return
  2306  		}
  2307  		defer res.Body.Close()
  2308  		b, err := io.ReadAll(res.Body)
  2309  		if err != nil {
  2310  			t.Error(err)
  2311  		}
  2312  		gotBody = string(b)
  2313  	}()
  2314  
  2315  	select {
  2316  	case <-reqc:
  2317  		// Request should be sent after trying to probe the request body for 200ms.
  2318  	case <-time.After(60 * time.Second):
  2319  		t.Errorf("request not sent after 60s")
  2320  	}
  2321  
  2322  	// Write the request body and wait for the request to complete.
  2323  	const content = "body"
  2324  	bodyw.Write([]byte(content))
  2325  	bodyw.Close()
  2326  	wg.Wait()
  2327  	if gotBody != content {
  2328  		t.Fatalf("server got body %q, want %q", gotBody, content)
  2329  	}
  2330  }
  2331  

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