Break reference cycle between WebSocketHandler and WebSocketProtocol on close.

bdarnell · bdarnell · commit 3e4b4cac6630 · 2013-04-14T15:42:24.000-04:00
This isn't strictly necessary, but it allows the refcounting CPython GC to clean things up without waiting for a full GC. Closes tornadoweb#382.
diff --git a/tornado/websocket.py b/tornado/websocket.py
@@ -210,6 +210,7 @@ def close(self):
         Once the close handshake is successful the socket will be closed.
         """
         self.ws_connection.close()
+        self.ws_connection = None
 
     def allow_draft76(self):
         """Override to enable support for the older "draft76" protocol.
