add Upgrade Response status code check to begin/abort websocket client

ws/server.go

@@ -76,6 +76,12 @@ func (s *Server) Launch() error {
 		upgrader, err := upgrader.Upgrade(sock)
 		if err != nil {
 			fmt.Printf(" - upgrade error: %s\n", err)
+			sock.Close()
+			continue
+		}
+		if upgrader.Response.GetStatusCode() != 101 {
+			fmt.Printf(" - upgrade bad request\n")
+			sock.Close()
 			continue
 		}