code review 4620049: http: make Headers be source of truth

src/pkg/http/reverseproxy_test.go

 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Reverse proxy tests.
 
 package http_test
 
 import (
         . "http"
@@ skipping 34 matching lines @@
         }
         if g, e := res.StatusCode, backendStatus; g != e {
                 t.Errorf("got res.StatusCode %d; expected %d", g, e)
         }
         if g, e := res.Header.Get("X-Foo"), "bar"; g != e {
                 t.Errorf("got X-Foo %q; expected %q", g, e)
         }
         if g, e := len(res.Header["Set-Cookie"]), 1; g != e {
                 t.Fatalf("got %d SetCookies, want %d", g, e)
         }
-        if cookie := res.SetCookies()[0]; cookie.Name != "flavor" {
+        if cookie := res.Cookies()[0]; cookie.Name != "flavor" {
                 t.Errorf("unexpected cookie %q", cookie.Name)
         }
         bodyBytes, _ := ioutil.ReadAll(res.Body)
         if g, e := string(bodyBytes), backendResponse; g != e {
                 t.Errorf("got body %q; expected %q", g, e)
         }
 }