github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/pkg/net/http/httputil/reverseproxy_test.go (about)

     1  // Copyright 2011 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  // Reverse proxy tests.
     6  
     7  package httputil
     8  
     9  import (
    10  	"io/ioutil"
    11  	"net/http"
    12  	"net/http/httptest"
    13  	"net/url"
    14  	"strings"
    15  	"testing"
    16  	"time"
    17  )
    18  
    19  func TestReverseProxy(t *testing.T) {
    20  	const backendResponse = "I am the backend"
    21  	const backendStatus = 404
    22  	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    23  		if len(r.TransferEncoding) > 0 {
    24  			t.Errorf("backend got unexpected TransferEncoding: %v", r.TransferEncoding)
    25  		}
    26  		if r.Header.Get("X-Forwarded-For") == "" {
    27  			t.Errorf("didn't get X-Forwarded-For header")
    28  		}
    29  		if c := r.Header.Get("Connection"); c != "" {
    30  			t.Errorf("handler got Connection header value %q", c)
    31  		}
    32  		if c := r.Header.Get("Upgrade"); c != "" {
    33  			t.Errorf("handler got Upgrade header value %q", c)
    34  		}
    35  		if g, e := r.Host, "some-name"; g != e {
    36  			t.Errorf("backend got Host header %q, want %q", g, e)
    37  		}
    38  		w.Header().Set("X-Foo", "bar")
    39  		http.SetCookie(w, &http.Cookie{Name: "flavor", Value: "chocolateChip"})
    40  		w.WriteHeader(backendStatus)
    41  		w.Write([]byte(backendResponse))
    42  	}))
    43  	defer backend.Close()
    44  	backendURL, err := url.Parse(backend.URL)
    45  	if err != nil {
    46  		t.Fatal(err)
    47  	}
    48  	proxyHandler := NewSingleHostReverseProxy(backendURL)
    49  	frontend := httptest.NewServer(proxyHandler)
    50  	defer frontend.Close()
    51  
    52  	getReq, _ := http.NewRequest("GET", frontend.URL, nil)
    53  	getReq.Host = "some-name"
    54  	getReq.Header.Set("Connection", "close")
    55  	getReq.Header.Set("Upgrade", "foo")
    56  	getReq.Close = true
    57  	res, err := http.DefaultClient.Do(getReq)
    58  	if err != nil {
    59  		t.Fatalf("Get: %v", err)
    60  	}
    61  	if g, e := res.StatusCode, backendStatus; g != e {
    62  		t.Errorf("got res.StatusCode %d; expected %d", g, e)
    63  	}
    64  	if g, e := res.Header.Get("X-Foo"), "bar"; g != e {
    65  		t.Errorf("got X-Foo %q; expected %q", g, e)
    66  	}
    67  	if g, e := len(res.Header["Set-Cookie"]), 1; g != e {
    68  		t.Fatalf("got %d SetCookies, want %d", g, e)
    69  	}
    70  	if cookie := res.Cookies()[0]; cookie.Name != "flavor" {
    71  		t.Errorf("unexpected cookie %q", cookie.Name)
    72  	}
    73  	bodyBytes, _ := ioutil.ReadAll(res.Body)
    74  	if g, e := string(bodyBytes), backendResponse; g != e {
    75  		t.Errorf("got body %q; expected %q", g, e)
    76  	}
    77  }
    78  
    79  func TestXForwardedFor(t *testing.T) {
    80  	const prevForwardedFor = "client ip"
    81  	const backendResponse = "I am the backend"
    82  	const backendStatus = 404
    83  	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    84  		if r.Header.Get("X-Forwarded-For") == "" {
    85  			t.Errorf("didn't get X-Forwarded-For header")
    86  		}
    87  		if !strings.Contains(r.Header.Get("X-Forwarded-For"), prevForwardedFor) {
    88  			t.Errorf("X-Forwarded-For didn't contain prior data")
    89  		}
    90  		w.WriteHeader(backendStatus)
    91  		w.Write([]byte(backendResponse))
    92  	}))
    93  	defer backend.Close()
    94  	backendURL, err := url.Parse(backend.URL)
    95  	if err != nil {
    96  		t.Fatal(err)
    97  	}
    98  	proxyHandler := NewSingleHostReverseProxy(backendURL)
    99  	frontend := httptest.NewServer(proxyHandler)
   100  	defer frontend.Close()
   101  
   102  	getReq, _ := http.NewRequest("GET", frontend.URL, nil)
   103  	getReq.Host = "some-name"
   104  	getReq.Header.Set("Connection", "close")
   105  	getReq.Header.Set("X-Forwarded-For", prevForwardedFor)
   106  	getReq.Close = true
   107  	res, err := http.DefaultClient.Do(getReq)
   108  	if err != nil {
   109  		t.Fatalf("Get: %v", err)
   110  	}
   111  	if g, e := res.StatusCode, backendStatus; g != e {
   112  		t.Errorf("got res.StatusCode %d; expected %d", g, e)
   113  	}
   114  	bodyBytes, _ := ioutil.ReadAll(res.Body)
   115  	if g, e := string(bodyBytes), backendResponse; g != e {
   116  		t.Errorf("got body %q; expected %q", g, e)
   117  	}
   118  }
   119  
   120  var proxyQueryTests = []struct {
   121  	baseSuffix string // suffix to add to backend URL
   122  	reqSuffix  string // suffix to add to frontend's request URL
   123  	want       string // what backend should see for final request URL (without ?)
   124  }{
   125  	{"", "", ""},
   126  	{"?sta=tic", "?us=er", "sta=tic&us=er"},
   127  	{"", "?us=er", "us=er"},
   128  	{"?sta=tic", "", "sta=tic"},
   129  }
   130  
   131  func TestReverseProxyQuery(t *testing.T) {
   132  	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
   133  		w.Header().Set("X-Got-Query", r.URL.RawQuery)
   134  		w.Write([]byte("hi"))
   135  	}))
   136  	defer backend.Close()
   137  
   138  	for i, tt := range proxyQueryTests {
   139  		backendURL, err := url.Parse(backend.URL + tt.baseSuffix)
   140  		if err != nil {
   141  			t.Fatal(err)
   142  		}
   143  		frontend := httptest.NewServer(NewSingleHostReverseProxy(backendURL))
   144  		req, _ := http.NewRequest("GET", frontend.URL+tt.reqSuffix, nil)
   145  		req.Close = true
   146  		res, err := http.DefaultClient.Do(req)
   147  		if err != nil {
   148  			t.Fatalf("%d. Get: %v", i, err)
   149  		}
   150  		if g, e := res.Header.Get("X-Got-Query"), tt.want; g != e {
   151  			t.Errorf("%d. got query %q; expected %q", i, g, e)
   152  		}
   153  		res.Body.Close()
   154  		frontend.Close()
   155  	}
   156  }
   157  
   158  func TestReverseProxyFlushInterval(t *testing.T) {
   159  	const expected = "hi"
   160  	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
   161  		w.Write([]byte(expected))
   162  	}))
   163  	defer backend.Close()
   164  
   165  	backendURL, err := url.Parse(backend.URL)
   166  	if err != nil {
   167  		t.Fatal(err)
   168  	}
   169  
   170  	proxyHandler := NewSingleHostReverseProxy(backendURL)
   171  	proxyHandler.FlushInterval = time.Microsecond
   172  
   173  	done := make(chan bool)
   174  	onExitFlushLoop = func() { done <- true }
   175  	defer func() { onExitFlushLoop = nil }()
   176  
   177  	frontend := httptest.NewServer(proxyHandler)
   178  	defer frontend.Close()
   179  
   180  	req, _ := http.NewRequest("GET", frontend.URL, nil)
   181  	req.Close = true
   182  	res, err := http.DefaultClient.Do(req)
   183  	if err != nil {
   184  		t.Fatalf("Get: %v", err)
   185  	}
   186  	defer res.Body.Close()
   187  	if bodyBytes, _ := ioutil.ReadAll(res.Body); string(bodyBytes) != expected {
   188  		t.Errorf("got body %q; expected %q", bodyBytes, expected)
   189  	}
   190  
   191  	select {
   192  	case <-done:
   193  		// OK
   194  	case <-time.After(5 * time.Second):
   195  		t.Error("maxLatencyWriter flushLoop() never exited")
   196  	}
   197  }