Source file src/net/http/fs_test.go

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package http_test
     6  
     7  import (
     8  	"bufio"
     9  	"bytes"
    10  	"compress/gzip"
    11  	"errors"
    12  	"fmt"
    13  	"internal/testenv"
    14  	"io"
    15  	"io/fs"
    16  	"mime"
    17  	"mime/multipart"
    18  	"net"
    19  	"net/http"
    20  	. "net/http"
    21  	"net/http/httptest"
    22  	"net/url"
    23  	"os"
    24  	"os/exec"
    25  	"path"
    26  	"path/filepath"
    27  	"regexp"
    28  	"runtime"
    29  	"slices"
    30  	"strconv"
    31  	"strings"
    32  	"testing"
    33  	"testing/fstest"
    34  	"time"
    35  )
    36  
    37  const (
    38  	testFile    = "testdata/file"
    39  	testFileLen = 11
    40  )
    41  
    42  type wantRange struct {
    43  	start, end int64 // range [start,end)
    44  }
    45  
    46  var ServeFileRangeTests = []struct {
    47  	r      string
    48  	code   int
    49  	ranges []wantRange
    50  }{
    51  	{r: "", code: StatusOK},
    52  	{r: "bytes=0-4", code: StatusPartialContent, ranges: []wantRange{{0, 5}}},
    53  	{r: "bytes=2-", code: StatusPartialContent, ranges: []wantRange{{2, testFileLen}}},
    54  	{r: "bytes=-5", code: StatusPartialContent, ranges: []wantRange{{testFileLen - 5, testFileLen}}},
    55  	{r: "bytes=3-7", code: StatusPartialContent, ranges: []wantRange{{3, 8}}},
    56  	{r: "bytes=0-0,-2", code: StatusPartialContent, ranges: []wantRange{{0, 1}, {testFileLen - 2, testFileLen}}},
    57  	{r: "bytes=0-1,5-8", code: StatusPartialContent, ranges: []wantRange{{0, 2}, {5, 9}}},
    58  	{r: "bytes=0-1,5-", code: StatusPartialContent, ranges: []wantRange{{0, 2}, {5, testFileLen}}},
    59  	{r: "bytes=5-1000", code: StatusPartialContent, ranges: []wantRange{{5, testFileLen}}},
    60  	{r: "bytes=0-,1-,2-,3-,4-", code: StatusOK}, // ignore wasteful range request
    61  	{r: "bytes=0-9", code: StatusPartialContent, ranges: []wantRange{{0, testFileLen - 1}}},
    62  	{r: "bytes=0-10", code: StatusPartialContent, ranges: []wantRange{{0, testFileLen}}},
    63  	{r: "bytes=0-11", code: StatusPartialContent, ranges: []wantRange{{0, testFileLen}}},
    64  	{r: "bytes=10-11", code: StatusPartialContent, ranges: []wantRange{{testFileLen - 1, testFileLen}}},
    65  	{r: "bytes=10-", code: StatusPartialContent, ranges: []wantRange{{testFileLen - 1, testFileLen}}},
    66  	{r: "bytes=11-", code: StatusRequestedRangeNotSatisfiable},
    67  	{r: "bytes=11-12", code: StatusRequestedRangeNotSatisfiable},
    68  	{r: "bytes=12-12", code: StatusRequestedRangeNotSatisfiable},
    69  	{r: "bytes=11-100", code: StatusRequestedRangeNotSatisfiable},
    70  	{r: "bytes=12-100", code: StatusRequestedRangeNotSatisfiable},
    71  	{r: "bytes=100-", code: StatusRequestedRangeNotSatisfiable},
    72  	{r: "bytes=100-1000", code: StatusRequestedRangeNotSatisfiable},
    73  }
    74  
    75  func TestServeFile(t *testing.T) { run(t, testServeFile) }
    76  func testServeFile(t *testing.T, mode testMode) {
    77  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
    78  		ServeFile(w, r, "testdata/file")
    79  	})).ts
    80  	c := ts.Client()
    81  
    82  	var err error
    83  
    84  	file, err := os.ReadFile(testFile)
    85  	if err != nil {
    86  		t.Fatal("reading file:", err)
    87  	}
    88  
    89  	// set up the Request (re-used for all tests)
    90  	var req Request
    91  	req.Header = make(Header)
    92  	if req.URL, err = url.Parse(ts.URL); err != nil {
    93  		t.Fatal("ParseURL:", err)
    94  	}
    95  
    96  	// Get contents via various methods.
    97  	//
    98  	// See https://go.dev/issue/59471 for a proposal to limit the set of methods handled.
    99  	// For now, test the historical behavior.
   100  	for _, method := range []string{
   101  		MethodGet,
   102  		MethodPost,
   103  		MethodPut,
   104  		MethodPatch,
   105  		MethodDelete,
   106  		MethodOptions,
   107  		MethodTrace,
   108  	} {
   109  		req.Method = method
   110  		_, body := getBody(t, method, req, c)
   111  		if !bytes.Equal(body, file) {
   112  			t.Fatalf("body mismatch for %v request: got %q, want %q", method, body, file)
   113  		}
   114  	}
   115  
   116  	// HEAD request.
   117  	req.Method = MethodHead
   118  	resp, body := getBody(t, "HEAD", req, c)
   119  	if len(body) != 0 {
   120  		t.Fatalf("body mismatch for HEAD request: got %q, want empty", body)
   121  	}
   122  	if got, want := resp.Header.Get("Content-Length"), fmt.Sprint(len(file)); got != want {
   123  		t.Fatalf("Content-Length mismatch for HEAD request: got %v, want %v", got, want)
   124  	}
   125  
   126  	// Range tests
   127  	req.Method = MethodGet
   128  Cases:
   129  	for _, rt := range ServeFileRangeTests {
   130  		if rt.r != "" {
   131  			req.Header.Set("Range", rt.r)
   132  		}
   133  		resp, body := getBody(t, fmt.Sprintf("range test %q", rt.r), req, c)
   134  		if resp.StatusCode != rt.code {
   135  			t.Errorf("range=%q: StatusCode=%d, want %d", rt.r, resp.StatusCode, rt.code)
   136  		}
   137  		if rt.code == StatusRequestedRangeNotSatisfiable {
   138  			continue
   139  		}
   140  		wantContentRange := ""
   141  		if len(rt.ranges) == 1 {
   142  			rng := rt.ranges[0]
   143  			wantContentRange = fmt.Sprintf("bytes %d-%d/%d", rng.start, rng.end-1, testFileLen)
   144  		}
   145  		cr := resp.Header.Get("Content-Range")
   146  		if cr != wantContentRange {
   147  			t.Errorf("range=%q: Content-Range = %q, want %q", rt.r, cr, wantContentRange)
   148  		}
   149  		ct := resp.Header.Get("Content-Type")
   150  		if len(rt.ranges) == 1 {
   151  			rng := rt.ranges[0]
   152  			wantBody := file[rng.start:rng.end]
   153  			if !bytes.Equal(body, wantBody) {
   154  				t.Errorf("range=%q: body = %q, want %q", rt.r, body, wantBody)
   155  			}
   156  			if strings.HasPrefix(ct, "multipart/byteranges") {
   157  				t.Errorf("range=%q content-type = %q; unexpected multipart/byteranges", rt.r, ct)
   158  			}
   159  		}
   160  		if len(rt.ranges) > 1 {
   161  			typ, params, err := mime.ParseMediaType(ct)
   162  			if err != nil {
   163  				t.Errorf("range=%q content-type = %q; %v", rt.r, ct, err)
   164  				continue
   165  			}
   166  			if typ != "multipart/byteranges" {
   167  				t.Errorf("range=%q content-type = %q; want multipart/byteranges", rt.r, typ)
   168  				continue
   169  			}
   170  			if params["boundary"] == "" {
   171  				t.Errorf("range=%q content-type = %q; lacks boundary", rt.r, ct)
   172  				continue
   173  			}
   174  			if g, w := resp.ContentLength, int64(len(body)); g != w {
   175  				t.Errorf("range=%q Content-Length = %d; want %d", rt.r, g, w)
   176  				continue
   177  			}
   178  			mr := multipart.NewReader(bytes.NewReader(body), params["boundary"])
   179  			for ri, rng := range rt.ranges {
   180  				part, err := mr.NextPart()
   181  				if err != nil {
   182  					t.Errorf("range=%q, reading part index %d: %v", rt.r, ri, err)
   183  					continue Cases
   184  				}
   185  				wantContentRange = fmt.Sprintf("bytes %d-%d/%d", rng.start, rng.end-1, testFileLen)
   186  				if g, w := part.Header.Get("Content-Range"), wantContentRange; g != w {
   187  					t.Errorf("range=%q: part Content-Range = %q; want %q", rt.r, g, w)
   188  				}
   189  				body, err := io.ReadAll(part)
   190  				if err != nil {
   191  					t.Errorf("range=%q, reading part index %d body: %v", rt.r, ri, err)
   192  					continue Cases
   193  				}
   194  				wantBody := file[rng.start:rng.end]
   195  				if !bytes.Equal(body, wantBody) {
   196  					t.Errorf("range=%q: body = %q, want %q", rt.r, body, wantBody)
   197  				}
   198  			}
   199  			_, err = mr.NextPart()
   200  			if err != io.EOF {
   201  				t.Errorf("range=%q; expected final error io.EOF; got %v", rt.r, err)
   202  			}
   203  		}
   204  	}
   205  }
   206  
   207  func TestServeFile_DotDot(t *testing.T) {
   208  	tests := []struct {
   209  		req        string
   210  		wantStatus int
   211  	}{
   212  		{"/testdata/file", 200},
   213  		{"/../file", 400},
   214  		{"/..", 400},
   215  		{"/../", 400},
   216  		{"/../foo", 400},
   217  		{"/..\\foo", 400},
   218  		{"/file/a", 200},
   219  		{"/file/a..", 200},
   220  		{"/file/a/..", 400},
   221  		{"/file/a\\..", 400},
   222  	}
   223  	for _, tt := range tests {
   224  		req, err := ReadRequest(bufio.NewReader(strings.NewReader("GET " + tt.req + " HTTP/1.1\r\nHost: foo\r\n\r\n")))
   225  		if err != nil {
   226  			t.Errorf("bad request %q: %v", tt.req, err)
   227  			continue
   228  		}
   229  		rec := httptest.NewRecorder()
   230  		ServeFile(rec, req, "testdata/file")
   231  		if rec.Code != tt.wantStatus {
   232  			t.Errorf("for request %q, status = %d; want %d", tt.req, rec.Code, tt.wantStatus)
   233  		}
   234  	}
   235  }
   236  
   237  // Tests that this doesn't panic. (Issue 30165)
   238  func TestServeFileDirPanicEmptyPath(t *testing.T) {
   239  	rec := httptest.NewRecorder()
   240  	req := httptest.NewRequest("GET", "/", nil)
   241  	req.URL.Path = ""
   242  	ServeFile(rec, req, "testdata")
   243  	res := rec.Result()
   244  	if res.StatusCode != 301 {
   245  		t.Errorf("code = %v; want 301", res.Status)
   246  	}
   247  }
   248  
   249  // Tests that ranges are ignored with serving empty content. (Issue 54794)
   250  func TestServeContentWithEmptyContentIgnoreRanges(t *testing.T) {
   251  	for _, r := range []string{
   252  		"bytes=0-128",
   253  		"bytes=1-",
   254  	} {
   255  		rec := httptest.NewRecorder()
   256  		req := httptest.NewRequest("GET", "/", nil)
   257  		req.Header.Set("Range", r)
   258  		ServeContent(rec, req, "nothing", time.Now(), bytes.NewReader(nil))
   259  		res := rec.Result()
   260  		if res.StatusCode != 200 {
   261  			t.Errorf("code = %v; want 200", res.Status)
   262  		}
   263  		bodyLen := rec.Body.Len()
   264  		if bodyLen != 0 {
   265  			t.Errorf("body.Len() = %v; want 0", res.Status)
   266  		}
   267  	}
   268  }
   269  
   270  var fsRedirectTestData = []struct {
   271  	original, redirect string
   272  }{
   273  	{"/test/index.html", "/test/"},
   274  	{"/test/testdata", "/test/testdata/"},
   275  	{"/test/testdata/file/", "/test/testdata/file"},
   276  }
   277  
   278  func TestFSRedirect(t *testing.T) { run(t, testFSRedirect) }
   279  func testFSRedirect(t *testing.T, mode testMode) {
   280  	ts := newClientServerTest(t, mode, StripPrefix("/test", FileServer(Dir(".")))).ts
   281  
   282  	for _, data := range fsRedirectTestData {
   283  		res, err := ts.Client().Get(ts.URL + data.original)
   284  		if err != nil {
   285  			t.Fatal(err)
   286  		}
   287  		res.Body.Close()
   288  		if g, e := res.Request.URL.Path, data.redirect; g != e {
   289  			t.Errorf("redirect from %s: got %s, want %s", data.original, g, e)
   290  		}
   291  	}
   292  }
   293  
   294  type testFileSystem struct {
   295  	open func(name string) (File, error)
   296  }
   297  
   298  func (fs *testFileSystem) Open(name string) (File, error) {
   299  	return fs.open(name)
   300  }
   301  
   302  func TestFileServerCleans(t *testing.T) {
   303  	defer afterTest(t)
   304  	ch := make(chan string, 1)
   305  	fs := FileServer(&testFileSystem{func(name string) (File, error) {
   306  		ch <- name
   307  		return nil, errors.New("file does not exist")
   308  	}})
   309  	tests := []struct {
   310  		reqPath, openArg string
   311  	}{
   312  		{"/foo.txt", "/foo.txt"},
   313  		{"//foo.txt", "/foo.txt"},
   314  		{"/../foo.txt", "/foo.txt"},
   315  	}
   316  	req, _ := NewRequest("GET", "http://example.com", nil)
   317  	for n, test := range tests {
   318  		rec := httptest.NewRecorder()
   319  		req.URL.Path = test.reqPath
   320  		fs.ServeHTTP(rec, req)
   321  		if got := <-ch; got != test.openArg {
   322  			t.Errorf("test %d: got %q, want %q", n, got, test.openArg)
   323  		}
   324  	}
   325  }
   326  
   327  func TestFileServerEscapesNames(t *testing.T) { run(t, testFileServerEscapesNames) }
   328  func testFileServerEscapesNames(t *testing.T, mode testMode) {
   329  	const dirListPrefix = "<!doctype html>\n<meta name=\"viewport\" content=\"width=device-width\">\n<pre>\n"
   330  	const dirListSuffix = "\n</pre>\n"
   331  	tests := []struct {
   332  		name, escaped string
   333  	}{
   334  		{`simple_name`, `<a href="simple_name">simple_name</a>`},
   335  		{`"'<>&`, `<a href="%22%27%3C%3E&">&#34;&#39;&lt;&gt;&amp;</a>`},
   336  		{`?foo=bar#baz`, `<a href="%3Ffoo=bar%23baz">?foo=bar#baz</a>`},
   337  		{`<combo>?foo`, `<a href="%3Ccombo%3E%3Ffoo">&lt;combo&gt;?foo</a>`},
   338  		{`foo:bar`, `<a href="./foo:bar">foo:bar</a>`},
   339  	}
   340  
   341  	// We put each test file in its own directory in the fakeFS so we can look at it in isolation.
   342  	fs := make(fakeFS)
   343  	for i, test := range tests {
   344  		testFile := &fakeFileInfo{basename: test.name}
   345  		fs[fmt.Sprintf("/%d", i)] = &fakeFileInfo{
   346  			dir:     true,
   347  			modtime: time.Unix(1000000000, 0).UTC(),
   348  			ents:    []*fakeFileInfo{testFile},
   349  		}
   350  		fs[fmt.Sprintf("/%d/%s", i, test.name)] = testFile
   351  	}
   352  
   353  	ts := newClientServerTest(t, mode, FileServer(&fs)).ts
   354  	for i, test := range tests {
   355  		url := fmt.Sprintf("%s/%d", ts.URL, i)
   356  		res, err := ts.Client().Get(url)
   357  		if err != nil {
   358  			t.Fatalf("test %q: Get: %v", test.name, err)
   359  		}
   360  		b, err := io.ReadAll(res.Body)
   361  		if err != nil {
   362  			t.Fatalf("test %q: read Body: %v", test.name, err)
   363  		}
   364  		s := string(b)
   365  		if !strings.HasPrefix(s, dirListPrefix) || !strings.HasSuffix(s, dirListSuffix) {
   366  			t.Errorf("test %q: listing dir, full output is %q, want prefix %q and suffix %q", test.name, s, dirListPrefix, dirListSuffix)
   367  		}
   368  		if trimmed := strings.TrimSuffix(strings.TrimPrefix(s, dirListPrefix), dirListSuffix); trimmed != test.escaped {
   369  			t.Errorf("test %q: listing dir, filename escaped to %q, want %q", test.name, trimmed, test.escaped)
   370  		}
   371  		res.Body.Close()
   372  	}
   373  }
   374  
   375  func TestFileServerSortsNames(t *testing.T) { run(t, testFileServerSortsNames) }
   376  func testFileServerSortsNames(t *testing.T, mode testMode) {
   377  	const contents = "I am a fake file"
   378  	dirMod := time.Unix(123, 0).UTC()
   379  	fileMod := time.Unix(1000000000, 0).UTC()
   380  	fs := fakeFS{
   381  		"/": &fakeFileInfo{
   382  			dir:     true,
   383  			modtime: dirMod,
   384  			ents: []*fakeFileInfo{
   385  				{
   386  					basename: "b",
   387  					modtime:  fileMod,
   388  					contents: contents,
   389  				},
   390  				{
   391  					basename: "a",
   392  					modtime:  fileMod,
   393  					contents: contents,
   394  				},
   395  			},
   396  		},
   397  	}
   398  
   399  	ts := newClientServerTest(t, mode, FileServer(&fs)).ts
   400  
   401  	res, err := ts.Client().Get(ts.URL)
   402  	if err != nil {
   403  		t.Fatalf("Get: %v", err)
   404  	}
   405  	defer res.Body.Close()
   406  
   407  	b, err := io.ReadAll(res.Body)
   408  	if err != nil {
   409  		t.Fatalf("read Body: %v", err)
   410  	}
   411  	s := string(b)
   412  	if !strings.Contains(s, "<a href=\"a\">a</a>\n<a href=\"b\">b</a>") {
   413  		t.Errorf("output appears to be unsorted:\n%s", s)
   414  	}
   415  }
   416  
   417  func mustRemoveAll(dir string) {
   418  	err := os.RemoveAll(dir)
   419  	if err != nil {
   420  		panic(err)
   421  	}
   422  }
   423  
   424  func TestFileServerImplicitLeadingSlash(t *testing.T) { run(t, testFileServerImplicitLeadingSlash) }
   425  func testFileServerImplicitLeadingSlash(t *testing.T, mode testMode) {
   426  	tempDir := t.TempDir()
   427  	if err := os.WriteFile(filepath.Join(tempDir, "foo.txt"), []byte("Hello world"), 0644); err != nil {
   428  		t.Fatalf("WriteFile: %v", err)
   429  	}
   430  	ts := newClientServerTest(t, mode, StripPrefix("/bar/", FileServer(Dir(tempDir)))).ts
   431  	get := func(suffix string) string {
   432  		res, err := ts.Client().Get(ts.URL + suffix)
   433  		if err != nil {
   434  			t.Fatalf("Get %s: %v", suffix, err)
   435  		}
   436  		b, err := io.ReadAll(res.Body)
   437  		if err != nil {
   438  			t.Fatalf("ReadAll %s: %v", suffix, err)
   439  		}
   440  		res.Body.Close()
   441  		return string(b)
   442  	}
   443  	if s := get("/bar/"); !strings.Contains(s, ">foo.txt<") {
   444  		t.Logf("expected a directory listing with foo.txt, got %q", s)
   445  	}
   446  	if s := get("/bar/foo.txt"); s != "Hello world" {
   447  		t.Logf("expected %q, got %q", "Hello world", s)
   448  	}
   449  }
   450  
   451  func TestDirJoin(t *testing.T) {
   452  	if runtime.GOOS == "windows" {
   453  		t.Skip("skipping test on windows")
   454  	}
   455  	wfi, err := os.Stat("/etc/hosts")
   456  	if err != nil {
   457  		t.Skip("skipping test; no /etc/hosts file")
   458  	}
   459  	test := func(d Dir, name string) {
   460  		f, err := d.Open(name)
   461  		if err != nil {
   462  			t.Fatalf("open of %s: %v", name, err)
   463  		}
   464  		defer f.Close()
   465  		gfi, err := f.Stat()
   466  		if err != nil {
   467  			t.Fatalf("stat of %s: %v", name, err)
   468  		}
   469  		if !os.SameFile(gfi, wfi) {
   470  			t.Errorf("%s got different file", name)
   471  		}
   472  	}
   473  	test(Dir("/etc/"), "/hosts")
   474  	test(Dir("/etc/"), "hosts")
   475  	test(Dir("/etc/"), "../../../../hosts")
   476  	test(Dir("/etc"), "/hosts")
   477  	test(Dir("/etc"), "hosts")
   478  	test(Dir("/etc"), "../../../../hosts")
   479  
   480  	// Not really directories, but since we use this trick in
   481  	// ServeFile, test it:
   482  	test(Dir("/etc/hosts"), "")
   483  	test(Dir("/etc/hosts"), "/")
   484  	test(Dir("/etc/hosts"), "../")
   485  }
   486  
   487  func TestEmptyDirOpenCWD(t *testing.T) {
   488  	test := func(d Dir) {
   489  		name := "fs_test.go"
   490  		f, err := d.Open(name)
   491  		if err != nil {
   492  			t.Fatalf("open of %s: %v", name, err)
   493  		}
   494  		defer f.Close()
   495  	}
   496  	test(Dir(""))
   497  	test(Dir("."))
   498  	test(Dir("./"))
   499  }
   500  
   501  func TestServeFileContentType(t *testing.T) { run(t, testServeFileContentType) }
   502  func testServeFileContentType(t *testing.T, mode testMode) {
   503  	const ctype = "icecream/chocolate"
   504  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   505  		switch r.FormValue("override") {
   506  		case "1":
   507  			w.Header().Set("Content-Type", ctype)
   508  		case "2":
   509  			// Explicitly inhibit sniffing.
   510  			w.Header()["Content-Type"] = []string{}
   511  		}
   512  		ServeFile(w, r, "testdata/file")
   513  	})).ts
   514  	get := func(override string, want []string) {
   515  		resp, err := ts.Client().Get(ts.URL + "?override=" + override)
   516  		if err != nil {
   517  			t.Fatal(err)
   518  		}
   519  		if h := resp.Header["Content-Type"]; !slices.Equal(h, want) {
   520  			t.Errorf("Content-Type mismatch: got %v, want %v", h, want)
   521  		}
   522  		resp.Body.Close()
   523  	}
   524  	get("0", []string{"text/plain; charset=utf-8"})
   525  	get("1", []string{ctype})
   526  	get("2", nil)
   527  }
   528  
   529  func TestServeFileMimeType(t *testing.T) { run(t, testServeFileMimeType) }
   530  func testServeFileMimeType(t *testing.T, mode testMode) {
   531  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   532  		ServeFile(w, r, "testdata/style.css")
   533  	})).ts
   534  	resp, err := ts.Client().Get(ts.URL)
   535  	if err != nil {
   536  		t.Fatal(err)
   537  	}
   538  	resp.Body.Close()
   539  	want := "text/css; charset=utf-8"
   540  	if h := resp.Header.Get("Content-Type"); h != want {
   541  		t.Errorf("Content-Type mismatch: got %q, want %q", h, want)
   542  	}
   543  }
   544  
   545  func TestServeFileFromCWD(t *testing.T) { run(t, testServeFileFromCWD) }
   546  func testServeFileFromCWD(t *testing.T, mode testMode) {
   547  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   548  		ServeFile(w, r, "fs_test.go")
   549  	})).ts
   550  	r, err := ts.Client().Get(ts.URL)
   551  	if err != nil {
   552  		t.Fatal(err)
   553  	}
   554  	r.Body.Close()
   555  	if r.StatusCode != 200 {
   556  		t.Fatalf("expected 200 OK, got %s", r.Status)
   557  	}
   558  }
   559  
   560  // Issue 13996
   561  func TestServeDirWithoutTrailingSlash(t *testing.T) { run(t, testServeDirWithoutTrailingSlash) }
   562  func testServeDirWithoutTrailingSlash(t *testing.T, mode testMode) {
   563  	e := "/testdata/"
   564  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   565  		ServeFile(w, r, ".")
   566  	})).ts
   567  	r, err := ts.Client().Get(ts.URL + "/testdata")
   568  	if err != nil {
   569  		t.Fatal(err)
   570  	}
   571  	r.Body.Close()
   572  	if g := r.Request.URL.Path; g != e {
   573  		t.Errorf("got %s, want %s", g, e)
   574  	}
   575  }
   576  
   577  // Tests that ServeFile doesn't add a Content-Length if a Content-Encoding is
   578  // specified.
   579  func TestServeFileWithContentEncoding(t *testing.T) { run(t, testServeFileWithContentEncoding) }
   580  func testServeFileWithContentEncoding(t *testing.T, mode testMode) {
   581  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   582  		w.Header().Set("Content-Encoding", "foo")
   583  		ServeFile(w, r, "testdata/file")
   584  
   585  		// Because the testdata is so small, it would fit in
   586  		// both the h1 and h2 Server's write buffers. For h1,
   587  		// sendfile is used, though, forcing a header flush at
   588  		// the io.Copy. http2 doesn't do a header flush so
   589  		// buffers all 11 bytes and then adds its own
   590  		// Content-Length. To prevent the Server's
   591  		// Content-Length and test ServeFile only, flush here.
   592  		w.(Flusher).Flush()
   593  	}))
   594  	resp, err := cst.c.Get(cst.ts.URL)
   595  	if err != nil {
   596  		t.Fatal(err)
   597  	}
   598  	resp.Body.Close()
   599  	if g, e := resp.ContentLength, int64(-1); g != e {
   600  		t.Errorf("Content-Length mismatch: got %d, want %d", g, e)
   601  	}
   602  }
   603  
   604  // Tests that ServeFile does not generate representation metadata when
   605  // file has not been modified, as per RFC 7232 section 4.1.
   606  func TestServeFileNotModified(t *testing.T) { run(t, testServeFileNotModified) }
   607  func testServeFileNotModified(t *testing.T, mode testMode) {
   608  	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   609  		w.Header().Set("Content-Type", "application/json")
   610  		w.Header().Set("Content-Encoding", "foo")
   611  		w.Header().Set("Etag", `"123"`)
   612  		ServeFile(w, r, "testdata/file")
   613  
   614  		// Because the testdata is so small, it would fit in
   615  		// both the h1 and h2 Server's write buffers. For h1,
   616  		// sendfile is used, though, forcing a header flush at
   617  		// the io.Copy. http2 doesn't do a header flush so
   618  		// buffers all 11 bytes and then adds its own
   619  		// Content-Length. To prevent the Server's
   620  		// Content-Length and test ServeFile only, flush here.
   621  		w.(Flusher).Flush()
   622  	}))
   623  	req, err := NewRequest("GET", cst.ts.URL, nil)
   624  	if err != nil {
   625  		t.Fatal(err)
   626  	}
   627  	req.Header.Set("If-None-Match", `"123"`)
   628  	resp, err := cst.c.Do(req)
   629  	if err != nil {
   630  		t.Fatal(err)
   631  	}
   632  	b, err := io.ReadAll(resp.Body)
   633  	resp.Body.Close()
   634  	if err != nil {
   635  		t.Fatal("reading Body:", err)
   636  	}
   637  	if len(b) != 0 {
   638  		t.Errorf("non-empty body")
   639  	}
   640  	if g, e := resp.StatusCode, StatusNotModified; g != e {
   641  		t.Errorf("status mismatch: got %d, want %d", g, e)
   642  	}
   643  	// HTTP1 transport sets ContentLength to 0.
   644  	if g, e1, e2 := resp.ContentLength, int64(-1), int64(0); g != e1 && g != e2 {
   645  		t.Errorf("Content-Length mismatch: got %d, want %d or %d", g, e1, e2)
   646  	}
   647  	if resp.Header.Get("Content-Type") != "" {
   648  		t.Errorf("Content-Type present, but it should not be")
   649  	}
   650  	if resp.Header.Get("Content-Encoding") != "" {
   651  		t.Errorf("Content-Encoding present, but it should not be")
   652  	}
   653  }
   654  
   655  func TestServeIndexHtml(t *testing.T) { run(t, testServeIndexHtml) }
   656  func testServeIndexHtml(t *testing.T, mode testMode) {
   657  	for i := 0; i < 2; i++ {
   658  		var h Handler
   659  		var name string
   660  		switch i {
   661  		case 0:
   662  			h = FileServer(Dir("."))
   663  			name = "Dir"
   664  		case 1:
   665  			h = FileServer(FS(os.DirFS(".")))
   666  			name = "DirFS"
   667  		}
   668  		t.Run(name, func(t *testing.T) {
   669  			const want = "index.html says hello\n"
   670  			ts := newClientServerTest(t, mode, h).ts
   671  
   672  			for _, path := range []string{"/testdata/", "/testdata/index.html"} {
   673  				res, err := ts.Client().Get(ts.URL + path)
   674  				if err != nil {
   675  					t.Fatal(err)
   676  				}
   677  				b, err := io.ReadAll(res.Body)
   678  				if err != nil {
   679  					t.Fatal("reading Body:", err)
   680  				}
   681  				if s := string(b); s != want {
   682  					t.Errorf("for path %q got %q, want %q", path, s, want)
   683  				}
   684  				res.Body.Close()
   685  			}
   686  		})
   687  	}
   688  }
   689  
   690  func TestServeIndexHtmlFS(t *testing.T) { run(t, testServeIndexHtmlFS) }
   691  func testServeIndexHtmlFS(t *testing.T, mode testMode) {
   692  	const want = "index.html says hello\n"
   693  	ts := newClientServerTest(t, mode, FileServer(Dir("."))).ts
   694  	defer ts.Close()
   695  
   696  	for _, path := range []string{"/testdata/", "/testdata/index.html"} {
   697  		res, err := ts.Client().Get(ts.URL + path)
   698  		if err != nil {
   699  			t.Fatal(err)
   700  		}
   701  		b, err := io.ReadAll(res.Body)
   702  		if err != nil {
   703  			t.Fatal("reading Body:", err)
   704  		}
   705  		if s := string(b); s != want {
   706  			t.Errorf("for path %q got %q, want %q", path, s, want)
   707  		}
   708  		res.Body.Close()
   709  	}
   710  }
   711  
   712  func TestFileServerZeroByte(t *testing.T) { run(t, testFileServerZeroByte) }
   713  func testFileServerZeroByte(t *testing.T, mode testMode) {
   714  	cst := newClientServerTest(t, mode, FileServer(Dir(".")))
   715  
   716  	req, err := NewRequest("GET", cst.ts.URL, nil)
   717  	if err != nil {
   718  		t.Fatal(err)
   719  	}
   720  	req.URL.Path = "/..\x00"
   721  
   722  	res, err := cst.c.Do(req)
   723  	if err != nil {
   724  		t.Fatal(err)
   725  	}
   726  	defer res.Body.Close()
   727  
   728  	if res.StatusCode == 200 {
   729  		t.Errorf("got status 200; want an error")
   730  	}
   731  }
   732  
   733  func TestFileServerNullByte(t *testing.T) { run(t, testFileServerNullByte) }
   734  func testFileServerNullByte(t *testing.T, mode testMode) {
   735  	ts := newClientServerTest(t, mode, FileServer(Dir("testdata"))).ts
   736  
   737  	for _, path := range []string{
   738  		"/file%00",
   739  		"/%00",
   740  		"/file/qwe/%00",
   741  	} {
   742  		res, err := ts.Client().Get(ts.URL + path)
   743  		if err != nil {
   744  			t.Fatal(err)
   745  		}
   746  		res.Body.Close()
   747  		if res.StatusCode != 404 {
   748  			t.Errorf("Get(%q): got status %v, want 404", path, res.StatusCode)
   749  		}
   750  
   751  	}
   752  }
   753  
   754  func TestFileServerNamesEscape(t *testing.T) { run(t, testFileServerNamesEscape) }
   755  func testFileServerNamesEscape(t *testing.T, mode testMode) {
   756  	ts := newClientServerTest(t, mode, FileServer(Dir("testdata"))).ts
   757  	for _, path := range []string{
   758  		"/../testdata/file",
   759  		"/NUL", // don't read from device files on Windows
   760  	} {
   761  		res, err := ts.Client().Get(ts.URL + path)
   762  		if err != nil {
   763  			t.Fatal(err)
   764  		}
   765  		res.Body.Close()
   766  		if res.StatusCode < 400 || res.StatusCode > 599 {
   767  			t.Errorf("Get(%q): got status %v, want 4xx or 5xx", path, res.StatusCode)
   768  		}
   769  
   770  	}
   771  }
   772  
   773  type fakeFileInfo struct {
   774  	dir      bool
   775  	basename string
   776  	modtime  time.Time
   777  	ents     []*fakeFileInfo
   778  	contents string
   779  	err      error
   780  }
   781  
   782  func (f *fakeFileInfo) Name() string       { return f.basename }
   783  func (f *fakeFileInfo) Sys() any           { return nil }
   784  func (f *fakeFileInfo) ModTime() time.Time { return f.modtime }
   785  func (f *fakeFileInfo) IsDir() bool        { return f.dir }
   786  func (f *fakeFileInfo) Size() int64        { return int64(len(f.contents)) }
   787  func (f *fakeFileInfo) Mode() fs.FileMode {
   788  	if f.dir {
   789  		return 0755 | fs.ModeDir
   790  	}
   791  	return 0644
   792  }
   793  
   794  func (f *fakeFileInfo) String() string {
   795  	return fs.FormatFileInfo(f)
   796  }
   797  
   798  type fakeFile struct {
   799  	io.ReadSeeker
   800  	fi     *fakeFileInfo
   801  	path   string // as opened
   802  	entpos int
   803  }
   804  
   805  func (f *fakeFile) Close() error               { return nil }
   806  func (f *fakeFile) Stat() (fs.FileInfo, error) { return f.fi, nil }
   807  func (f *fakeFile) Readdir(count int) ([]fs.FileInfo, error) {
   808  	if !f.fi.dir {
   809  		return nil, fs.ErrInvalid
   810  	}
   811  	var fis []fs.FileInfo
   812  
   813  	limit := f.entpos + count
   814  	if count <= 0 || limit > len(f.fi.ents) {
   815  		limit = len(f.fi.ents)
   816  	}
   817  	for ; f.entpos < limit; f.entpos++ {
   818  		fis = append(fis, f.fi.ents[f.entpos])
   819  	}
   820  
   821  	if len(fis) == 0 && count > 0 {
   822  		return fis, io.EOF
   823  	} else {
   824  		return fis, nil
   825  	}
   826  }
   827  
   828  type fakeFS map[string]*fakeFileInfo
   829  
   830  func (fsys fakeFS) Open(name string) (File, error) {
   831  	name = path.Clean(name)
   832  	f, ok := fsys[name]
   833  	if !ok {
   834  		return nil, fs.ErrNotExist
   835  	}
   836  	if f.err != nil {
   837  		return nil, f.err
   838  	}
   839  	return &fakeFile{ReadSeeker: strings.NewReader(f.contents), fi: f, path: name}, nil
   840  }
   841  
   842  func TestDirectoryIfNotModified(t *testing.T) { run(t, testDirectoryIfNotModified) }
   843  func testDirectoryIfNotModified(t *testing.T, mode testMode) {
   844  	const indexContents = "I am a fake index.html file"
   845  	fileMod := time.Unix(1000000000, 0).UTC()
   846  	fileModStr := fileMod.Format(TimeFormat)
   847  	dirMod := time.Unix(123, 0).UTC()
   848  	indexFile := &fakeFileInfo{
   849  		basename: "index.html",
   850  		modtime:  fileMod,
   851  		contents: indexContents,
   852  	}
   853  	fs := fakeFS{
   854  		"/": &fakeFileInfo{
   855  			dir:     true,
   856  			modtime: dirMod,
   857  			ents:    []*fakeFileInfo{indexFile},
   858  		},
   859  		"/index.html": indexFile,
   860  	}
   861  
   862  	modDone := make(chan struct{})
   863  	fsHandler := FileServer(fs)
   864  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   865  		fsHandler.ServeHTTP(w, r)
   866  		// After the first "If-Modified-Since" request, advance the /index.html
   867  		// file's modtime, but not the directory's
   868  		if r.Header.Get("If-Modified-Since") != "" && indexFile.modtime.Equal(fileMod) {
   869  			indexFile.modtime = indexFile.modtime.Add(1 * time.Hour)
   870  			close(modDone)
   871  		}
   872  	})).ts
   873  
   874  	// Initial fetch of /index.html.
   875  	res, err := ts.Client().Get(ts.URL)
   876  	if err != nil {
   877  		t.Fatal(err)
   878  	}
   879  	b, err := io.ReadAll(res.Body)
   880  	if err != nil {
   881  		t.Fatal(err)
   882  	}
   883  	if string(b) != indexContents {
   884  		t.Fatalf("Got body %q; want %q", b, indexContents)
   885  	}
   886  	res.Body.Close()
   887  	lastMod := res.Header.Get("Last-Modified")
   888  	if lastMod != fileModStr {
   889  		t.Fatalf("initial Last-Modified = %q; want %q", lastMod, fileModStr)
   890  	}
   891  
   892  	// Fetch /index.html when it has not been modified.
   893  	req, _ := NewRequest("GET", ts.URL, nil)
   894  	req.Header.Set("If-Modified-Since", lastMod)
   895  	c := ts.Client()
   896  	res, err = c.Do(req)
   897  	if err != nil {
   898  		t.Fatal(err)
   899  	}
   900  	if res.StatusCode != 304 {
   901  		t.Fatalf("Code after If-Modified-Since request = %v; want 304", res.StatusCode)
   902  	}
   903  	res.Body.Close()
   904  
   905  	// Fetch /index.html after it has been modified.
   906  	<-modDone
   907  	res, err = c.Do(req)
   908  	if err != nil {
   909  		t.Fatal(err)
   910  	}
   911  	if res.StatusCode != 200 {
   912  		t.Fatalf("Code after second If-Modified-Since request = %v; want 200; res is %#v", res.StatusCode, res)
   913  	}
   914  	res.Body.Close()
   915  }
   916  
   917  func mustStat(t *testing.T, fileName string) fs.FileInfo {
   918  	fi, err := os.Stat(fileName)
   919  	if err != nil {
   920  		t.Fatal(err)
   921  	}
   922  	return fi
   923  }
   924  
   925  func TestServeContent(t *testing.T) { run(t, testServeContent) }
   926  func testServeContent(t *testing.T, mode testMode) {
   927  	type serveParam struct {
   928  		name        string
   929  		modtime     time.Time
   930  		content     io.ReadSeeker
   931  		contentType string
   932  		etag        string
   933  	}
   934  	servec := make(chan serveParam, 1)
   935  	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
   936  		p := <-servec
   937  		if p.etag != "" {
   938  			w.Header().Set("ETag", p.etag)
   939  		}
   940  		if p.contentType != "" {
   941  			w.Header().Set("Content-Type", p.contentType)
   942  		}
   943  		ServeContent(w, r, p.name, p.modtime, p.content)
   944  	})).ts
   945  
   946  	type testCase struct {
   947  		// One of file or content must be set:
   948  		file    string
   949  		content io.ReadSeeker
   950  
   951  		modtime          time.Time
   952  		serveETag        string // optional
   953  		serveContentType string // optional
   954  		reqHeader        map[string]string
   955  		wantLastMod      string
   956  		wantContentType  string
   957  		wantContentRange string
   958  		wantStatus       int
   959  	}
   960  	htmlModTime := mustStat(t, "testdata/index.html").ModTime()
   961  	tests := map[string]testCase{
   962  		"no_last_modified": {
   963  			file:            "testdata/style.css",
   964  			wantContentType: "text/css; charset=utf-8",
   965  			wantStatus:      200,
   966  		},
   967  		"with_last_modified": {
   968  			file:            "testdata/index.html",
   969  			wantContentType: "text/html; charset=utf-8",
   970  			modtime:         htmlModTime,
   971  			wantLastMod:     htmlModTime.UTC().Format(TimeFormat),
   972  			wantStatus:      200,
   973  		},
   974  		"not_modified_modtime": {
   975  			file:      "testdata/style.css",
   976  			serveETag: `"foo"`, // Last-Modified sent only when no ETag
   977  			modtime:   htmlModTime,
   978  			reqHeader: map[string]string{
   979  				"If-Modified-Since": htmlModTime.UTC().Format(TimeFormat),
   980  			},
   981  			wantStatus: 304,
   982  		},
   983  		"not_modified_modtime_with_contenttype": {
   984  			file:             "testdata/style.css",
   985  			serveContentType: "text/css", // explicit content type
   986  			serveETag:        `"foo"`,    // Last-Modified sent only when no ETag
   987  			modtime:          htmlModTime,
   988  			reqHeader: map[string]string{
   989  				"If-Modified-Since": htmlModTime.UTC().Format(TimeFormat),
   990  			},
   991  			wantStatus: 304,
   992  		},
   993  		"not_modified_etag": {
   994  			file:      "testdata/style.css",
   995  			serveETag: `"foo"`,
   996  			reqHeader: map[string]string{
   997  				"If-None-Match": `"foo"`,
   998  			},
   999  			wantStatus: 304,
  1000  		},
  1001  		"not_modified_etag_no_seek": {
  1002  			content:   panicOnSeek{nil}, // should never be called
  1003  			serveETag: `W/"foo"`,        // If-None-Match uses weak ETag comparison
  1004  			reqHeader: map[string]string{
  1005  				"If-None-Match": `"baz", W/"foo"`,
  1006  			},
  1007  			wantStatus: 304,
  1008  		},
  1009  		"if_none_match_mismatch": {
  1010  			file:      "testdata/style.css",
  1011  			serveETag: `"foo"`,
  1012  			reqHeader: map[string]string{
  1013  				"If-None-Match": `"Foo"`,
  1014  			},
  1015  			wantStatus:      200,
  1016  			wantContentType: "text/css; charset=utf-8",
  1017  		},
  1018  		"if_none_match_malformed": {
  1019  			file:      "testdata/style.css",
  1020  			serveETag: `"foo"`,
  1021  			reqHeader: map[string]string{
  1022  				"If-None-Match": `,`,
  1023  			},
  1024  			wantStatus:      200,
  1025  			wantContentType: "text/css; charset=utf-8",
  1026  		},
  1027  		"range_good": {
  1028  			file:      "testdata/style.css",
  1029  			serveETag: `"A"`,
  1030  			reqHeader: map[string]string{
  1031  				"Range": "bytes=0-4",
  1032  			},
  1033  			wantStatus:       StatusPartialContent,
  1034  			wantContentType:  "text/css; charset=utf-8",
  1035  			wantContentRange: "bytes 0-4/8",
  1036  		},
  1037  		"range_match": {
  1038  			file:      "testdata/style.css",
  1039  			serveETag: `"A"`,
  1040  			reqHeader: map[string]string{
  1041  				"Range":    "bytes=0-4",
  1042  				"If-Range": `"A"`,
  1043  			},
  1044  			wantStatus:       StatusPartialContent,
  1045  			wantContentType:  "text/css; charset=utf-8",
  1046  			wantContentRange: "bytes 0-4/8",
  1047  		},
  1048  		"range_match_weak_etag": {
  1049  			file:      "testdata/style.css",
  1050  			serveETag: `W/"A"`,
  1051  			reqHeader: map[string]string{
  1052  				"Range":    "bytes=0-4",
  1053  				"If-Range": `W/"A"`,
  1054  			},
  1055  			wantStatus:      200,
  1056  			wantContentType: "text/css; charset=utf-8",
  1057  		},
  1058  		"range_no_overlap": {
  1059  			file:      "testdata/style.css",
  1060  			serveETag: `"A"`,
  1061  			reqHeader: map[string]string{
  1062  				"Range": "bytes=10-20",
  1063  			},
  1064  			wantStatus:       StatusRequestedRangeNotSatisfiable,
  1065  			wantContentType:  "text/plain; charset=utf-8",
  1066  			wantContentRange: "bytes */8",
  1067  		},
  1068  		// An If-Range resource for entity "A", but entity "B" is now current.
  1069  		// The Range request should be ignored.
  1070  		"range_no_match": {
  1071  			file:      "testdata/style.css",
  1072  			serveETag: `"A"`,
  1073  			reqHeader: map[string]string{
  1074  				"Range":    "bytes=0-4",
  1075  				"If-Range": `"B"`,
  1076  			},
  1077  			wantStatus:      200,
  1078  			wantContentType: "text/css; charset=utf-8",
  1079  		},
  1080  		"range_with_modtime": {
  1081  			file:    "testdata/style.css",
  1082  			modtime: time.Date(2014, 6, 25, 17, 12, 18, 0 /* nanos */, time.UTC),
  1083  			reqHeader: map[string]string{
  1084  				"Range":    "bytes=0-4",
  1085  				"If-Range": "Wed, 25 Jun 2014 17:12:18 GMT",
  1086  			},
  1087  			wantStatus:       StatusPartialContent,
  1088  			wantContentType:  "text/css; charset=utf-8",
  1089  			wantContentRange: "bytes 0-4/8",
  1090  			wantLastMod:      "Wed, 25 Jun 2014 17:12:18 GMT",
  1091  		},
  1092  		"range_with_modtime_mismatch": {
  1093  			file:    "testdata/style.css",
  1094  			modtime: time.Date(2014, 6, 25, 17, 12, 18, 0 /* nanos */, time.UTC),
  1095  			reqHeader: map[string]string{
  1096  				"Range":    "bytes=0-4",
  1097  				"If-Range": "Wed, 25 Jun 2014 17:12:19 GMT",
  1098  			},
  1099  			wantStatus:      StatusOK,
  1100  			wantContentType: "text/css; charset=utf-8",
  1101  			wantLastMod:     "Wed, 25 Jun 2014 17:12:18 GMT",
  1102  		},
  1103  		"range_with_modtime_nanos": {
  1104  			file:    "testdata/style.css",
  1105  			modtime: time.Date(2014, 6, 25, 17, 12, 18, 123 /* nanos */, time.UTC),
  1106  			reqHeader: map[string]string{
  1107  				"Range":    "bytes=0-4",
  1108  				"If-Range": "Wed, 25 Jun 2014 17:12:18 GMT",
  1109  			},
  1110  			wantStatus:       StatusPartialContent,
  1111  			wantContentType:  "text/css; charset=utf-8",
  1112  			wantContentRange: "bytes 0-4/8",
  1113  			wantLastMod:      "Wed, 25 Jun 2014 17:12:18 GMT",
  1114  		},
  1115  		"unix_zero_modtime": {
  1116  			content:         strings.NewReader("<html>foo"),
  1117  			modtime:         time.Unix(0, 0),
  1118  			wantStatus:      StatusOK,
  1119  			wantContentType: "text/html; charset=utf-8",
  1120  		},
  1121  		"ifmatch_matches": {
  1122  			file:      "testdata/style.css",
  1123  			serveETag: `"A"`,
  1124  			reqHeader: map[string]string{
  1125  				"If-Match": `"Z", "A"`,
  1126  			},
  1127  			wantStatus:      200,
  1128  			wantContentType: "text/css; charset=utf-8",
  1129  		},
  1130  		"ifmatch_star": {
  1131  			file:      "testdata/style.css",
  1132  			serveETag: `"A"`,
  1133  			reqHeader: map[string]string{
  1134  				"If-Match": `*`,
  1135  			},
  1136  			wantStatus:      200,
  1137  			wantContentType: "text/css; charset=utf-8",
  1138  		},
  1139  		"ifmatch_failed": {
  1140  			file:      "testdata/style.css",
  1141  			serveETag: `"A"`,
  1142  			reqHeader: map[string]string{
  1143  				"If-Match": `"B"`,
  1144  			},
  1145  			wantStatus: 412,
  1146  		},
  1147  		"ifmatch_fails_on_weak_etag": {
  1148  			file:      "testdata/style.css",
  1149  			serveETag: `W/"A"`,
  1150  			reqHeader: map[string]string{
  1151  				"If-Match": `W/"A"`,
  1152  			},
  1153  			wantStatus: 412,
  1154  		},
  1155  		"if_unmodified_since_true": {
  1156  			file:    "testdata/style.css",
  1157  			modtime: htmlModTime,
  1158  			reqHeader: map[string]string{
  1159  				"If-Unmodified-Since": htmlModTime.UTC().Format(TimeFormat),
  1160  			},
  1161  			wantStatus:      200,
  1162  			wantContentType: "text/css; charset=utf-8",
  1163  			wantLastMod:     htmlModTime.UTC().Format(TimeFormat),
  1164  		},
  1165  		"if_unmodified_since_false": {
  1166  			file:    "testdata/style.css",
  1167  			modtime: htmlModTime,
  1168  			reqHeader: map[string]string{
  1169  				"If-Unmodified-Since": htmlModTime.Add(-2 * time.Second).UTC().Format(TimeFormat),
  1170  			},
  1171  			wantStatus:  412,
  1172  			wantLastMod: htmlModTime.UTC().Format(TimeFormat),
  1173  		},
  1174  	}
  1175  	for testName, tt := range tests {
  1176  		var contentBytes []byte
  1177  		if sr, ok := tt.content.(*strings.Reader); ok {
  1178  			var err error
  1179  			if contentBytes, err = io.ReadAll(sr); err != nil {
  1180  				t.Fatal(err)
  1181  			}
  1182  		}
  1183  		for _, method := range []string{"GET", "HEAD"} {
  1184  			var content io.ReadSeeker
  1185  			if tt.file != "" {
  1186  				f, err := os.Open(tt.file)
  1187  				if err != nil {
  1188  					t.Fatalf("test %q: %v", testName, err)
  1189  				}
  1190  				defer f.Close()
  1191  				content = f
  1192  			} else {
  1193  				content = strings.NewReader(string(contentBytes))
  1194  			}
  1195  
  1196  			servec <- serveParam{
  1197  				name:        filepath.Base(tt.file),
  1198  				content:     content,
  1199  				modtime:     tt.modtime,
  1200  				etag:        tt.serveETag,
  1201  				contentType: tt.serveContentType,
  1202  			}
  1203  			req, err := NewRequest(method, ts.URL, nil)
  1204  			if err != nil {
  1205  				t.Fatal(err)
  1206  			}
  1207  			for k, v := range tt.reqHeader {
  1208  				req.Header.Set(k, v)
  1209  			}
  1210  
  1211  			c := ts.Client()
  1212  			res, err := c.Do(req)
  1213  			if err != nil {
  1214  				t.Fatal(err)
  1215  			}
  1216  			io.Copy(io.Discard, res.Body)
  1217  			res.Body.Close()
  1218  			if res.StatusCode != tt.wantStatus {
  1219  				t.Errorf("test %q using %q: got status = %d; want %d", testName, method, res.StatusCode, tt.wantStatus)
  1220  			}
  1221  			if g, e := res.Header.Get("Content-Type"), tt.wantContentType; g != e {
  1222  				t.Errorf("test %q using %q: got content-type = %q, want %q", testName, method, g, e)
  1223  			}
  1224  			if g, e := res.Header.Get("Content-Range"), tt.wantContentRange; g != e {
  1225  				t.Errorf("test %q using %q: got content-range = %q, want %q", testName, method, g, e)
  1226  			}
  1227  			if g, e := res.Header.Get("Last-Modified"), tt.wantLastMod; g != e {
  1228  				t.Errorf("test %q using %q: got last-modified = %q, want %q", testName, method, g, e)
  1229  			}
  1230  		}
  1231  	}
  1232  }
  1233  
  1234  // Issue 12991
  1235  func TestServerFileStatError(t *testing.T) {
  1236  	rec := httptest.NewRecorder()
  1237  	r, _ := NewRequest("GET", "http://foo/", nil)
  1238  	redirect := false
  1239  	name := "file.txt"
  1240  	fs := issue12991FS{}
  1241  	ExportServeFile(rec, r, fs, name, redirect)
  1242  	if body := rec.Body.String(); !strings.Contains(body, "403") || !strings.Contains(body, "Forbidden") {
  1243  		t.Errorf("wanted 403 forbidden message; got: %s", body)
  1244  	}
  1245  }
  1246  
  1247  type issue12991FS struct{}
  1248  
  1249  func (issue12991FS) Open(string) (File, error) { return issue12991File{}, nil }
  1250  
  1251  type issue12991File struct{ File }
  1252  
  1253  func (issue12991File) Stat() (fs.FileInfo, error) { return nil, fs.ErrPermission }
  1254  func (issue12991File) Close() error               { return nil }
  1255  
  1256  func TestFileServerErrorMessages(t *testing.T) {
  1257  	run(t, func(t *testing.T, mode testMode) {
  1258  		t.Run("keepheaders=0", func(t *testing.T) {
  1259  			testFileServerErrorMessages(t, mode, false)
  1260  		})
  1261  		t.Run("keepheaders=1", func(t *testing.T) {
  1262  			testFileServerErrorMessages(t, mode, true)
  1263  		})
  1264  	}, testNotParallel)
  1265  }
  1266  func testFileServerErrorMessages(t *testing.T, mode testMode, keepHeaders bool) {
  1267  	if keepHeaders {
  1268  		t.Setenv("GODEBUG", "httpservecontentkeepheaders=1")
  1269  	}
  1270  	fs := fakeFS{
  1271  		"/500": &fakeFileInfo{
  1272  			err: errors.New("random error"),
  1273  		},
  1274  		"/403": &fakeFileInfo{
  1275  			err: &fs.PathError{Err: fs.ErrPermission},
  1276  		},
  1277  	}
  1278  	server := FileServer(fs)
  1279  	h := func(w http.ResponseWriter, r *http.Request) {
  1280  		w.Header().Set("Etag", "étude")
  1281  		w.Header().Set("Cache-Control", "yes")
  1282  		w.Header().Set("Content-Type", "awesome")
  1283  		w.Header().Set("Last-Modified", "yesterday")
  1284  		server.ServeHTTP(w, r)
  1285  	}
  1286  	ts := newClientServerTest(t, mode, http.HandlerFunc(h)).ts
  1287  	c := ts.Client()
  1288  	for _, code := range []int{403, 404, 500} {
  1289  		res, err := c.Get(fmt.Sprintf("%s/%d", ts.URL, code))
  1290  		if err != nil {
  1291  			t.Errorf("Error fetching /%d: %v", code, err)
  1292  			continue
  1293  		}
  1294  		res.Body.Close()
  1295  		if res.StatusCode != code {
  1296  			t.Errorf("GET /%d: StatusCode = %d; want %d", code, res.StatusCode, code)
  1297  		}
  1298  		for _, hdr := range []string{"Etag", "Last-Modified", "Cache-Control"} {
  1299  			if v, got := res.Header[hdr]; got != keepHeaders {
  1300  				want := "not present"
  1301  				if keepHeaders {
  1302  					want = "present"
  1303  				}
  1304  				t.Errorf("GET /%d: Header[%q] = %q, want %v", code, hdr, v, want)
  1305  			}
  1306  		}
  1307  	}
  1308  }
  1309  
  1310  // verifies that sendfile is being used on Linux
  1311  func TestLinuxSendfile(t *testing.T) {
  1312  	setParallel(t)
  1313  	defer afterTest(t)
  1314  	if runtime.GOOS != "linux" {
  1315  		t.Skip("skipping; linux-only test")
  1316  	}
  1317  	if _, err := exec.LookPath("strace"); err != nil {
  1318  		t.Skip("skipping; strace not found in path")
  1319  	}
  1320  
  1321  	ln, err := net.Listen("tcp", "127.0.0.1:0")
  1322  	if err != nil {
  1323  		t.Fatal(err)
  1324  	}
  1325  	lnf, err := ln.(*net.TCPListener).File()
  1326  	if err != nil {
  1327  		t.Fatal(err)
  1328  	}
  1329  	defer ln.Close()
  1330  
  1331  	// Attempt to run strace, and skip on failure - this test requires SYS_PTRACE.
  1332  	if err := testenv.Command(t, "strace", "-f", "-q", os.Args[0], "-test.run=^$").Run(); err != nil {
  1333  		t.Skipf("skipping; failed to run strace: %v", err)
  1334  	}
  1335  
  1336  	filename := fmt.Sprintf("1kb-%d", os.Getpid())
  1337  	filepath := path.Join(os.TempDir(), filename)
  1338  
  1339  	if err := os.WriteFile(filepath, bytes.Repeat([]byte{'a'}, 1<<10), 0755); err != nil {
  1340  		t.Fatal(err)
  1341  	}
  1342  	defer os.Remove(filepath)
  1343  
  1344  	var buf strings.Builder
  1345  	child := testenv.Command(t, "strace", "-f", "-q", os.Args[0], "-test.run=^TestLinuxSendfileChild$")
  1346  	child.ExtraFiles = append(child.ExtraFiles, lnf)
  1347  	child.Env = append([]string{"GO_WANT_HELPER_PROCESS=1"}, os.Environ()...)
  1348  	child.Stdout = &buf
  1349  	child.Stderr = &buf
  1350  	if err := child.Start(); err != nil {
  1351  		t.Skipf("skipping; failed to start straced child: %v", err)
  1352  	}
  1353  
  1354  	res, err := Get(fmt.Sprintf("http://%s/%s", ln.Addr(), filename))
  1355  	if err != nil {
  1356  		t.Fatalf("http client error: %v", err)
  1357  	}
  1358  	_, err = io.Copy(io.Discard, res.Body)
  1359  	if err != nil {
  1360  		t.Fatalf("client body read error: %v", err)
  1361  	}
  1362  	res.Body.Close()
  1363  
  1364  	// Force child to exit cleanly.
  1365  	Post(fmt.Sprintf("http://%s/quit", ln.Addr()), "", nil)
  1366  	child.Wait()
  1367  
  1368  	rx := regexp.MustCompile(`\b(n64:)?sendfile(64)?\(`)
  1369  	out := buf.String()
  1370  	if !rx.MatchString(out) {
  1371  		t.Errorf("no sendfile system call found in:\n%s", out)
  1372  	}
  1373  }
  1374  
  1375  func getBody(t *testing.T, testName string, req Request, client *Client) (*Response, []byte) {
  1376  	r, err := client.Do(&req)
  1377  	if err != nil {
  1378  		t.Fatalf("%s: for URL %q, send error: %v", testName, req.URL.String(), err)
  1379  	}
  1380  	b, err := io.ReadAll(r.Body)
  1381  	if err != nil {
  1382  		t.Fatalf("%s: for URL %q, reading body: %v", testName, req.URL.String(), err)
  1383  	}
  1384  	return r, b
  1385  }
  1386  
  1387  // TestLinuxSendfileChild isn't a real test. It's used as a helper process
  1388  // for TestLinuxSendfile.
  1389  func TestLinuxSendfileChild(*testing.T) {
  1390  	if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
  1391  		return
  1392  	}
  1393  	defer os.Exit(0)
  1394  	fd3 := os.NewFile(3, "ephemeral-port-listener")
  1395  	ln, err := net.FileListener(fd3)
  1396  	if err != nil {
  1397  		panic(err)
  1398  	}
  1399  	mux := NewServeMux()
  1400  	mux.Handle("/", FileServer(Dir(os.TempDir())))
  1401  	mux.HandleFunc("/quit", func(ResponseWriter, *Request) {
  1402  		os.Exit(0)
  1403  	})
  1404  	s := &Server{Handler: mux}
  1405  	err = s.Serve(ln)
  1406  	if err != nil {
  1407  		panic(err)
  1408  	}
  1409  }
  1410  
  1411  // Issues 18984, 49552: tests that requests for paths beyond files return not-found errors
  1412  func TestFileServerNotDirError(t *testing.T) {
  1413  	run(t, func(t *testing.T, mode testMode) {
  1414  		t.Run("Dir", func(t *testing.T) {
  1415  			testFileServerNotDirError(t, mode, func(path string) FileSystem { return Dir(path) })
  1416  		})
  1417  		t.Run("FS", func(t *testing.T) {
  1418  			testFileServerNotDirError(t, mode, func(path string) FileSystem { return FS(os.DirFS(path)) })
  1419  		})
  1420  	})
  1421  }
  1422  
  1423  func testFileServerNotDirError(t *testing.T, mode testMode, newfs func(string) FileSystem) {
  1424  	ts := newClientServerTest(t, mode, FileServer(newfs("testdata"))).ts
  1425  
  1426  	res, err := ts.Client().Get(ts.URL + "/index.html/not-a-file")
  1427  	if err != nil {
  1428  		t.Fatal(err)
  1429  	}
  1430  	res.Body.Close()
  1431  	if res.StatusCode != 404 {
  1432  		t.Errorf("StatusCode = %v; want 404", res.StatusCode)
  1433  	}
  1434  
  1435  	test := func(name string, fsys FileSystem) {
  1436  		t.Run(name, func(t *testing.T) {
  1437  			_, err = fsys.Open("/index.html/not-a-file")
  1438  			if err == nil {
  1439  				t.Fatal("err == nil; want != nil")
  1440  			}
  1441  			if !errors.Is(err, fs.ErrNotExist) {
  1442  				t.Errorf("err = %v; errors.Is(err, fs.ErrNotExist) = %v; want true", err,
  1443  					errors.Is(err, fs.ErrNotExist))
  1444  			}
  1445  
  1446  			_, err = fsys.Open("/index.html/not-a-dir/not-a-file")
  1447  			if err == nil {
  1448  				t.Fatal("err == nil; want != nil")
  1449  			}
  1450  			if !errors.Is(err, fs.ErrNotExist) {
  1451  				t.Errorf("err = %v; errors.Is(err, fs.ErrNotExist) = %v; want true", err,
  1452  					errors.Is(err, fs.ErrNotExist))
  1453  			}
  1454  		})
  1455  	}
  1456  
  1457  	absPath, err := filepath.Abs("testdata")
  1458  	if err != nil {
  1459  		t.Fatal("get abs path:", err)
  1460  	}
  1461  
  1462  	test("RelativePath", newfs("testdata"))
  1463  	test("AbsolutePath", newfs(absPath))
  1464  }
  1465  
  1466  func TestFileServerCleanPath(t *testing.T) {
  1467  	tests := []struct {
  1468  		path     string
  1469  		wantCode int
  1470  		wantOpen []string
  1471  	}{
  1472  		{"/", 200, []string{"/", "/index.html"}},
  1473  		{"/dir", 301, []string{"/dir"}},
  1474  		{"/dir/", 200, []string{"/dir", "/dir/index.html"}},
  1475  	}
  1476  	for _, tt := range tests {
  1477  		var log []string
  1478  		rr := httptest.NewRecorder()
  1479  		req, _ := NewRequest("GET", "http://foo.localhost"+tt.path, nil)
  1480  		FileServer(fileServerCleanPathDir{&log}).ServeHTTP(rr, req)
  1481  		if !slices.Equal(log, tt.wantOpen) {
  1482  			t.Logf("For %s: Opens = %q; want %q", tt.path, log, tt.wantOpen)
  1483  		}
  1484  		if rr.Code != tt.wantCode {
  1485  			t.Logf("For %s: Response code = %d; want %d", tt.path, rr.Code, tt.wantCode)
  1486  		}
  1487  	}
  1488  }
  1489  
  1490  type fileServerCleanPathDir struct {
  1491  	log *[]string
  1492  }
  1493  
  1494  func (d fileServerCleanPathDir) Open(path string) (File, error) {
  1495  	*(d.log) = append(*(d.log), path)
  1496  	if path == "/" || path == "/dir" || path == "/dir/" {
  1497  		// Just return back something that's a directory.
  1498  		return Dir(".").Open(".")
  1499  	}
  1500  	return nil, fs.ErrNotExist
  1501  }
  1502  
  1503  type panicOnSeek struct{ io.ReadSeeker }
  1504  
  1505  func TestScanETag(t *testing.T) {
  1506  	tests := []struct {
  1507  		in         string
  1508  		wantETag   string
  1509  		wantRemain string
  1510  	}{
  1511  		{`W/"etag-1"`, `W/"etag-1"`, ""},
  1512  		{`"etag-2"`, `"etag-2"`, ""},
  1513  		{`"etag-1", "etag-2"`, `"etag-1"`, `, "etag-2"`},
  1514  		{"", "", ""},
  1515  		{"W/", "", ""},
  1516  		{`W/"truc`, "", ""},
  1517  		{`w/"case-sensitive"`, "", ""},
  1518  		{`"spaced etag"`, "", ""},
  1519  	}
  1520  	for _, test := range tests {
  1521  		etag, remain := ExportScanETag(test.in)
  1522  		if etag != test.wantETag || remain != test.wantRemain {
  1523  			t.Errorf("scanETag(%q)=%q %q, want %q %q", test.in, etag, remain, test.wantETag, test.wantRemain)
  1524  		}
  1525  	}
  1526  }
  1527  
  1528  // Issue 40940: Ensure that we only accept non-negative suffix-lengths
  1529  // in "Range": "bytes=-N", and should reject "bytes=--2".
  1530  func TestServeFileRejectsInvalidSuffixLengths(t *testing.T) {
  1531  	run(t, testServeFileRejectsInvalidSuffixLengths, []testMode{http1Mode, https1Mode, http2Mode})
  1532  }
  1533  func testServeFileRejectsInvalidSuffixLengths(t *testing.T, mode testMode) {
  1534  	cst := newClientServerTest(t, mode, FileServer(Dir("testdata"))).ts
  1535  
  1536  	tests := []struct {
  1537  		r        string
  1538  		wantCode int
  1539  		wantBody string
  1540  	}{
  1541  		{"bytes=--6", 416, "invalid range\n"},
  1542  		{"bytes=--0", 416, "invalid range\n"},
  1543  		{"bytes=---0", 416, "invalid range\n"},
  1544  		{"bytes=-6", 206, "hello\n"},
  1545  		{"bytes=6-", 206, "html says hello\n"},
  1546  		{"bytes=-6-", 416, "invalid range\n"},
  1547  		{"bytes=-0", 206, ""},
  1548  		{"bytes=", 200, "index.html says hello\n"},
  1549  	}
  1550  
  1551  	for _, tt := range tests {
  1552  		t.Run(tt.r, func(t *testing.T) {
  1553  			req, err := NewRequest("GET", cst.URL+"/index.html", nil)
  1554  			if err != nil {
  1555  				t.Fatal(err)
  1556  			}
  1557  			req.Header.Set("Range", tt.r)
  1558  			res, err := cst.Client().Do(req)
  1559  			if err != nil {
  1560  				t.Fatal(err)
  1561  			}
  1562  			if g, w := res.StatusCode, tt.wantCode; g != w {
  1563  				t.Errorf("StatusCode mismatch: got %d want %d", g, w)
  1564  			}
  1565  			slurp, err := io.ReadAll(res.Body)
  1566  			res.Body.Close()
  1567  			if err != nil {
  1568  				t.Fatal(err)
  1569  			}
  1570  			if g, w := string(slurp), tt.wantBody; g != w {
  1571  				t.Fatalf("Content mismatch:\nGot:  %q\nWant: %q", g, w)
  1572  			}
  1573  		})
  1574  	}
  1575  }
  1576  
  1577  func TestFileServerMethods(t *testing.T) {
  1578  	run(t, testFileServerMethods)
  1579  }
  1580  func testFileServerMethods(t *testing.T, mode testMode) {
  1581  	ts := newClientServerTest(t, mode, FileServer(Dir("testdata"))).ts
  1582  
  1583  	file, err := os.ReadFile(testFile)
  1584  	if err != nil {
  1585  		t.Fatal("reading file:", err)
  1586  	}
  1587  
  1588  	// Get contents via various methods.
  1589  	//
  1590  	// See https://go.dev/issue/59471 for a proposal to limit the set of methods handled.
  1591  	// For now, test the historical behavior.
  1592  	for _, method := range []string{
  1593  		MethodGet,
  1594  		MethodHead,
  1595  		MethodPost,
  1596  		MethodPut,
  1597  		MethodPatch,
  1598  		MethodDelete,
  1599  		MethodOptions,
  1600  		MethodTrace,
  1601  	} {
  1602  		req, _ := NewRequest(method, ts.URL+"/file", nil)
  1603  		t.Log(req.URL)
  1604  		res, err := ts.Client().Do(req)
  1605  		if err != nil {
  1606  			t.Fatal(err)
  1607  		}
  1608  		body, err := io.ReadAll(res.Body)
  1609  		res.Body.Close()
  1610  		if err != nil {
  1611  			t.Fatal(err)
  1612  		}
  1613  		wantBody := file
  1614  		if method == MethodHead {
  1615  			wantBody = nil
  1616  		}
  1617  		if !bytes.Equal(body, wantBody) {
  1618  			t.Fatalf("%v: got body %q, want %q", method, body, wantBody)
  1619  		}
  1620  		if got, want := res.Header.Get("Content-Length"), fmt.Sprint(len(file)); got != want {
  1621  			t.Fatalf("%v: got Content-Length %q, want %q", method, got, want)
  1622  		}
  1623  	}
  1624  }
  1625  
  1626  func TestFileServerFS(t *testing.T) {
  1627  	filename := "index.html"
  1628  	contents := []byte("index.html says hello")
  1629  	fsys := fstest.MapFS{
  1630  		filename: {Data: contents},
  1631  	}
  1632  	ts := newClientServerTest(t, http1Mode, FileServerFS(fsys)).ts
  1633  	defer ts.Close()
  1634  
  1635  	res, err := ts.Client().Get(ts.URL + "/" + filename)
  1636  	if err != nil {
  1637  		t.Fatal(err)
  1638  	}
  1639  	b, err := io.ReadAll(res.Body)
  1640  	if err != nil {
  1641  		t.Fatal("reading Body:", err)
  1642  	}
  1643  	if s := string(b); s != string(contents) {
  1644  		t.Errorf("for path %q got %q, want %q", filename, s, contents)
  1645  	}
  1646  	res.Body.Close()
  1647  }
  1648  
  1649  func TestServeFileFS(t *testing.T) {
  1650  	filename := "index.html"
  1651  	contents := []byte("index.html says hello")
  1652  	fsys := fstest.MapFS{
  1653  		filename: {Data: contents},
  1654  	}
  1655  	ts := newClientServerTest(t, http1Mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1656  		ServeFileFS(w, r, fsys, filename)
  1657  	})).ts
  1658  	defer ts.Close()
  1659  
  1660  	res, err := ts.Client().Get(ts.URL + "/" + filename)
  1661  	if err != nil {
  1662  		t.Fatal(err)
  1663  	}
  1664  	b, err := io.ReadAll(res.Body)
  1665  	if err != nil {
  1666  		t.Fatal("reading Body:", err)
  1667  	}
  1668  	if s := string(b); s != string(contents) {
  1669  		t.Errorf("for path %q got %q, want %q", filename, s, contents)
  1670  	}
  1671  	res.Body.Close()
  1672  }
  1673  
  1674  func TestServeFileZippingResponseWriter(t *testing.T) {
  1675  	// This test exercises a pattern which is incorrect,
  1676  	// but has been observed enough in the world that we don't want to break it.
  1677  	//
  1678  	// The server is setting "Content-Encoding: gzip",
  1679  	// wrapping the ResponseWriter in an implementation which gzips data written to it,
  1680  	// and passing this ResponseWriter to ServeFile.
  1681  	//
  1682  	// This means ServeFile cannot properly set a Content-Length header, because it
  1683  	// doesn't know what content it is going to send--the ResponseWriter is modifying
  1684  	// the bytes sent.
  1685  	//
  1686  	// Range requests are always going to be broken in this scenario,
  1687  	// but verify that we can serve non-range requests correctly.
  1688  	filename := "index.html"
  1689  	contents := []byte("contents will be sent with Content-Encoding: gzip")
  1690  	fsys := fstest.MapFS{
  1691  		filename: {Data: contents},
  1692  	}
  1693  	ts := newClientServerTest(t, http1Mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1694  		w.Header().Set("Content-Encoding", "gzip")
  1695  		gzw := gzip.NewWriter(w)
  1696  		defer gzw.Close()
  1697  		ServeFileFS(gzipResponseWriter{w: gzw, ResponseWriter: w}, r, fsys, filename)
  1698  	})).ts
  1699  	defer ts.Close()
  1700  
  1701  	res, err := ts.Client().Get(ts.URL + "/" + filename)
  1702  	if err != nil {
  1703  		t.Fatal(err)
  1704  	}
  1705  	b, err := io.ReadAll(res.Body)
  1706  	if err != nil {
  1707  		t.Fatal("reading Body:", err)
  1708  	}
  1709  	if s := string(b); s != string(contents) {
  1710  		t.Errorf("for path %q got %q, want %q", filename, s, contents)
  1711  	}
  1712  	res.Body.Close()
  1713  }
  1714  
  1715  type gzipResponseWriter struct {
  1716  	ResponseWriter
  1717  	w *gzip.Writer
  1718  }
  1719  
  1720  func (grw gzipResponseWriter) Write(b []byte) (int, error) {
  1721  	return grw.w.Write(b)
  1722  }
  1723  
  1724  func (grw gzipResponseWriter) Flush() {
  1725  	grw.w.Flush()
  1726  	if fw, ok := grw.ResponseWriter.(http.Flusher); ok {
  1727  		fw.Flush()
  1728  	}
  1729  }
  1730  
  1731  // Issue 63769
  1732  func TestFileServerDirWithRootFile(t *testing.T) { run(t, testFileServerDirWithRootFile) }
  1733  func testFileServerDirWithRootFile(t *testing.T, mode testMode) {
  1734  	testDirFile := func(t *testing.T, h Handler) {
  1735  		ts := newClientServerTest(t, mode, h).ts
  1736  		defer ts.Close()
  1737  
  1738  		res, err := ts.Client().Get(ts.URL)
  1739  		if err != nil {
  1740  			t.Fatal(err)
  1741  		}
  1742  		if g, w := res.StatusCode, StatusInternalServerError; g != w {
  1743  			t.Errorf("StatusCode mismatch: got %d, want: %d", g, w)
  1744  		}
  1745  		res.Body.Close()
  1746  	}
  1747  
  1748  	t.Run("FileServer", func(t *testing.T) {
  1749  		testDirFile(t, FileServer(Dir("testdata/index.html")))
  1750  	})
  1751  
  1752  	t.Run("FileServerFS", func(t *testing.T) {
  1753  		testDirFile(t, FileServerFS(os.DirFS("testdata/index.html")))
  1754  	})
  1755  }
  1756  
  1757  func TestServeContentHeadersWithError(t *testing.T) {
  1758  	t.Run("keepheaders=0", func(t *testing.T) {
  1759  		testServeContentHeadersWithError(t, false)
  1760  	})
  1761  	t.Run("keepheaders=1", func(t *testing.T) {
  1762  		testServeContentHeadersWithError(t, true)
  1763  	})
  1764  }
  1765  func testServeContentHeadersWithError(t *testing.T, keepHeaders bool) {
  1766  	if keepHeaders {
  1767  		t.Setenv("GODEBUG", "httpservecontentkeepheaders=1")
  1768  	}
  1769  	contents := []byte("content")
  1770  	ts := newClientServerTest(t, http1Mode, HandlerFunc(func(w ResponseWriter, r *Request) {
  1771  		w.Header().Set("Content-Type", "application/octet-stream")
  1772  		w.Header().Set("Content-Length", strconv.Itoa(len(contents)))
  1773  		w.Header().Set("Content-Encoding", "gzip")
  1774  		w.Header().Set("Etag", `"abcdefgh"`)
  1775  		w.Header().Set("Last-Modified", "Wed, 21 Oct 2015 07:28:00 GMT")
  1776  		w.Header().Set("Cache-Control", "immutable")
  1777  		w.Header().Set("Other-Header", "test")
  1778  		ServeContent(w, r, "", time.Time{}, bytes.NewReader(contents))
  1779  	})).ts
  1780  	defer ts.Close()
  1781  
  1782  	req, err := NewRequest("GET", ts.URL, nil)
  1783  	if err != nil {
  1784  		t.Fatal(err)
  1785  	}
  1786  	req.Header.Set("Range", "bytes=100-10000")
  1787  
  1788  	c := ts.Client()
  1789  	res, err := c.Do(req)
  1790  	if err != nil {
  1791  		t.Fatal(err)
  1792  	}
  1793  
  1794  	out, _ := io.ReadAll(res.Body)
  1795  	res.Body.Close()
  1796  
  1797  	ifKept := func(s string) string {
  1798  		if keepHeaders {
  1799  			return s
  1800  		}
  1801  		return ""
  1802  	}
  1803  	if g, e := res.StatusCode, 416; g != e {
  1804  		t.Errorf("got status = %d; want %d", g, e)
  1805  	}
  1806  	if g, e := string(out), "invalid range: failed to overlap\n"; g != e {
  1807  		t.Errorf("got body = %q; want %q", g, e)
  1808  	}
  1809  	if g, e := res.Header.Get("Content-Type"), "text/plain; charset=utf-8"; g != e {
  1810  		t.Errorf("got content-type = %q, want %q", g, e)
  1811  	}
  1812  	if g, e := res.Header.Get("Content-Length"), strconv.Itoa(len(out)); g != e {
  1813  		t.Errorf("got content-length = %q, want %q", g, e)
  1814  	}
  1815  	if g, e := res.Header.Get("Content-Encoding"), ifKept("gzip"); g != e {
  1816  		t.Errorf("got content-encoding = %q, want %q", g, e)
  1817  	}
  1818  	if g, e := res.Header.Get("Etag"), ifKept(`"abcdefgh"`); g != e {
  1819  		t.Errorf("got etag = %q, want %q", g, e)
  1820  	}
  1821  	if g, e := res.Header.Get("Last-Modified"), ifKept("Wed, 21 Oct 2015 07:28:00 GMT"); g != e {
  1822  		t.Errorf("got last-modified = %q, want %q", g, e)
  1823  	}
  1824  	if g, e := res.Header.Get("Cache-Control"), ifKept("immutable"); g != e {
  1825  		t.Errorf("got cache-control = %q, want %q", g, e)
  1826  	}
  1827  	if g, e := res.Header.Get("Content-Range"), "bytes */7"; g != e {
  1828  		t.Errorf("got content-range = %q, want %q", g, e)
  1829  	}
  1830  	if g, e := res.Header.Get("Other-Header"), "test"; g != e {
  1831  		t.Errorf("got other-header = %q, want %q", g, e)
  1832  	}
  1833  }
  1834  

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