http: fix req.Cookie(name) with cookies in one header

Fixes #1974

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4654042

src/pkg/http/cookie.go

@@ -173,7 +173,7 @@ func readCookies(h Header, filter string) []*Cookie {
 	if !ok {
 		return cookies
 	}
-Lines:
+
 	for _, line := range lines {
 		parts := strings.Split(strings.TrimSpace(line), ";", -1)
 		if len(parts) == 1 && parts[0] == "" {
@@ -194,7 +194,7 @@ Lines:
 				continue
 			}
 			if filter != "" && filter != name {
-				continue Lines
+				continue
 			}
 			val, success := parseCookieValue(val)
 			if !success {

src/pkg/http/cookie_test.go

@@ -171,6 +171,21 @@ var readCookiesTests = []struct {
 			&Cookie{Name: "c2", Value: "v2"},
 		},
 	},
+	{
+		Header{"Cookie": {"Cookie-1=v$1; c2=v2"}},
+		"",
+		[]*Cookie{
+			&Cookie{Name: "Cookie-1", Value: "v$1"},
+			&Cookie{Name: "c2", Value: "v2"},
+		},
+	},
+	{
+		Header{"Cookie": {"Cookie-1=v$1; c2=v2"}},
+		"c2",
+		[]*Cookie{
+			&Cookie{Name: "c2", Value: "v2"},
+		},
+	},
 }
 
 func TestReadCookies(t *testing.T) {
@@ -178,7 +193,7 @@ func TestReadCookies(t *testing.T) {
 		for n := 0; n < 2; n++ { // to verify readCookies doesn't mutate its input                                                  
 			c := readCookies(tt.Header, tt.Filter)
 			if !reflect.DeepEqual(c, tt.Cookies) {
-				t.Errorf("#%d readCookies: have\n%s\nwant\n%s\n", i, toJSON(c), toJSON(tt.Cookies))
+				t.Errorf("#%d readCookies:\nhave: %s\nwant: %s\n", i, toJSON(c), toJSON(tt.Cookies))
 				continue
 			}
 		}