httputil: move ReverseProxy out of http

http diet plan, continued.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5305090

src/pkg/Makefile

@@ -212,7 +212,6 @@ NOTEST+=\
 	net/dict\
 	net/http/pprof\
 	net/http/httptest\
-	net/http/httputil\
 	runtime/cgo\
 	syscall\
 	testing\

src/pkg/net/http/Makefile

@@ -16,7 +16,6 @@ GOFILES=\
 	lex.go\
 	request.go\
 	response.go\
-	reverseproxy.go\
 	server.go\
 	sniff.go\
 	status.go\

src/pkg/net/http/httputil/Makefile

@@ -7,5 +7,6 @@ include ../../../../Make.inc
 TARG=net/http/httputil
 GOFILES=\
 	persist.go\
+	reverseproxy.go\
 
 include ../../../../Make.pkg

src/pkg/net/http/httputil/reverseproxy.go

@@ -4,9 +4,10 @@
 
 // HTTP reverse proxy handler
 
-package http
+package httputil
 
 import (
+	"http"
 	"io"
 	"log"
 	"net"
@@ -24,11 +25,11 @@ type ReverseProxy struct {
 	// the request into a new request to be sent
 	// using Transport. Its response is then copied
 	// back to the original client unmodified.
-	Director func(*Request)
+	Director func(*http.Request)
 
-	// The Transport used to perform proxy requests.
-	// If nil, DefaultTransport is used.
-	Transport RoundTripper
+	// The transport used to perform proxy requests.
+	// If nil, http.DefaultTransport is used.
+	Transport http.RoundTripper
 
 	// FlushInterval specifies the flush interval, in
 	// nanoseconds, to flush to the client while
@@ -54,7 +55,7 @@ func singleJoiningSlash(a, b string) string {
 // target's path is "/base" and the incoming request was for "/dir",
 // the target request will be for /base/dir.
 func NewSingleHostReverseProxy(target *url.URL) *ReverseProxy {
-	director := func(req *Request) {
+	director := func(req *http.Request) {
 		req.URL.Scheme = target.Scheme
 		req.URL.Host = target.Host
 		req.URL.Path = singleJoiningSlash(target.Path, req.URL.Path)
@@ -68,7 +69,7 @@ func NewSingleHostReverseProxy(target *url.URL) *ReverseProxy {
 	return &ReverseProxy{Director: director}
 }
 
-func copyHeader(dst, src Header) {
+func copyHeader(dst, src http.Header) {
 	for k, vv := range src {
 		for _, v := range vv {
 			dst.Add(k, v)
@@ -76,13 +77,13 @@ func copyHeader(dst, src Header) {
 	}
 }
 
-func (p *ReverseProxy) ServeHTTP(rw ResponseWriter, req *Request) {
+func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 	transport := p.Transport
 	if transport == nil {
-		transport = DefaultTransport
+		transport = http.DefaultTransport
 	}
 
-	outreq := new(Request)
+	outreq := new(http.Request)
 	*outreq = *req // includes shallow copies of maps, but okay
 
 	p.Director(outreq)
@@ -96,7 +97,7 @@ func (p *ReverseProxy) ServeHTTP(rw ResponseWriter, req *Request) {
 	// to us.  This is modifying the same underlying map from req
 	// (shallow copied above) so we only copy it if necessary.
 	if outreq.Header.Get("Connection") != "" {
-		outreq.Header = make(Header)
+		outreq.Header = make(http.Header)
 		copyHeader(outreq.Header, req.Header)
 		outreq.Header.Del("Connection")
 	}
@@ -108,7 +109,7 @@ func (p *ReverseProxy) ServeHTTP(rw ResponseWriter, req *Request) {
 	res, err := transport.RoundTrip(outreq)
 	if err != nil {
 		log.Printf("http: proxy error: %v", err)
-		rw.WriteHeader(StatusInternalServerError)
+		rw.WriteHeader(http.StatusInternalServerError)
 		return
 	}
 
@@ -129,7 +130,7 @@ func (p *ReverseProxy) ServeHTTP(rw ResponseWriter, req *Request) {
 
 type writeFlusher interface {
 	io.Writer
-	Flusher
+	http.Flusher
 }
 
 type maxLatencyWriter struct {

src/pkg/net/http/httputil/reverseproxy_test.go

@@ -4,10 +4,10 @@
 
 // Reverse proxy tests.
 
-package http_test
+package httputil
 
 import (
-	. "http"
+	"http"
 	"http/httptest"
 	"io/ioutil"
 	"testing"
@@ -17,7 +17,7 @@ import (
 func TestReverseProxy(t *testing.T) {
 	const backendResponse = "I am the backend"
 	const backendStatus = 404
-	backend := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
+	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if len(r.TransferEncoding) > 0 {
 			t.Errorf("backend got unexpected TransferEncoding: %v", r.TransferEncoding)
 		}
@@ -31,7 +31,7 @@ func TestReverseProxy(t *testing.T) {
 			t.Errorf("backend got Host header %q, want %q", g, e)
 		}
 		w.Header().Set("X-Foo", "bar")
-		SetCookie(w, &Cookie{Name: "flavor", Value: "chocolateChip"})
+		http.SetCookie(w, &http.Cookie{Name: "flavor", Value: "chocolateChip"})
 		w.WriteHeader(backendStatus)
 		w.Write([]byte(backendResponse))
 	}))
@@ -44,11 +44,11 @@ func TestReverseProxy(t *testing.T) {
 	frontend := httptest.NewServer(proxyHandler)
 	defer frontend.Close()
 
-	getReq, _ := NewRequest("GET", frontend.URL, nil)
+	getReq, _ := http.NewRequest("GET", frontend.URL, nil)
 	getReq.Host = "some-name"
 	getReq.Header.Set("Connection", "close")
 	getReq.Close = true
-	res, err := DefaultClient.Do(getReq)
+	res, err := http.DefaultClient.Do(getReq)
 	if err != nil {
 		t.Fatalf("Get: %v", err)
 	}