Mention in Sec-WebSocket-Version all versions supported by tornado

 As RFC 6455 recommends for asnwer for unsopported protocol.

diff --git a/tornado/websocket.py b/tornado/websocket.py
index 5c762adb62bb5fed289e974497ba7fa0fb6eed61..163a8b85ce0ee43eb0dc8a219cc7a67fc75fa5e3 100644 (file)
--- a/tornado/websocket.py
+++ b/tornado/websocket.py
@@ -179,7 +179,7 @@ class WebSocketHandler(tornado.web.RequestHandler):
             if not self.stream.closed():
                 self.stream.write(tornado.escape.utf8(
                     "HTTP/1.1 426 Upgrade Required\r\n"
-                    "Sec-WebSocket-Version: 8\r\n\r\n"))
+                    "Sec-WebSocket-Version: 7, 8, 13\r\n\r\n"))
                 self.stream.close()