Require GET in Upgrader.Upgrade.

Return error if the request method is not GET.

Remove all request method tests from the examples.

client_server_test.go

@@ -56,11 +56,6 @@ func newTLSServer(t *testing.T) *cstServer {
 }
 
 func (t cstHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if r.Method != "GET" {
-		t.Logf("method %s not allowed", r.Method)
-		http.Error(w, "method not allowed", 405)
-		return
-	}
 	subprotos := Subprotocols(r)
 	if !reflect.DeepEqual(subprotos, cstDialer.Subprotocols) {
 		t.Logf("subprotols=%v, want %v", subprotos, cstDialer.Subprotocols)
@@ -287,6 +282,26 @@ func TestDialBadHeader(t *testing.T) {
 	}
 }
 
+func TestBadMethod(t *testing.T) {
+	s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ws, err := cstUpgrader.Upgrade(w, r, nil)
+		if err == nil {
+			t.Errorf("handshake succeeded, expect fail")
+			ws.Close()
+		}
+	}))
+	defer s.Close()
+
+	resp, err := http.PostForm(s.URL, url.Values{})
+	if err != nil {
+		t.Fatalf("PostForm returned error %v", err)
+	}
+	resp.Body.Close()
+	if resp.StatusCode != http.StatusMethodNotAllowed {
+		t.Errorf("Status = %d, want %d", resp.StatusCode, http.StatusMethodNotAllowed)
+	}
+}
+
 func TestHandshake(t *testing.T) {
 	s := newServer(t)
 	defer s.Close()

examples/chat/conn.go

@@ -90,10 +90,6 @@ func (c *connection) writePump() {
 
 // serveWs handles websocket requests from the peer.
 func serveWs(w http.ResponseWriter, r *http.Request) {
-	if r.Method != "GET" {
-		http.Error(w, "Method not allowed", 405)
-		return
-	}
 	ws, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
 		log.Println(err)

examples/command/main.go

@@ -95,11 +95,6 @@ func internalError(ws *websocket.Conn, msg string, err error) {
 var upgrader = websocket.Upgrader{}
 
 func serveWs(w http.ResponseWriter, r *http.Request) {
-	if r.Method != "GET" {
-		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
-		return
-	}
-
 	ws, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
 		log.Println("upgrade:", err)

examples/echo/server.go

@@ -23,10 +23,6 @@ func echo(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "Not found", 404)
 		return
 	}
-	if r.Method != "GET" {
-		http.Error(w, "Method not allowed", 405)
-		return
-	}
 	c, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
 		log.Print("upgrade:", err)

server.go

@@ -93,6 +93,9 @@ func (u *Upgrader) selectSubprotocol(r *http.Request, responseHeader http.Header
 // request. Use the responseHeader to specify cookies (Set-Cookie) and the
 // application negotiated subprotocol (Sec-Websocket-Protocol).
 func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header) (*Conn, error) {
+	if r.Method != "GET" {
+		return u.returnError(w, r, http.StatusMethodNotAllowed, "websocket: method not GET")
+	}
 	if values := r.Header["Sec-Websocket-Version"]; len(values) == 0 || values[0] != "13" {
 		return u.returnError(w, r, http.StatusBadRequest, "websocket: version != 13")
 	}