Look for "Upgrade" in Connection instead of matching exactly.

The Connection header can contain other stuff, for instance Firefox 6
puts "keep-alive" there.

websocket.py

@@ -54,7 +54,7 @@ def process(self):
         connection = self.requestHeaders.getRawHeaders("Connection", [None])[0]
         upgrade = self.requestHeaders.getRawHeaders("Upgrade", [None])[0]
 
-        if connection != "Upgrade":
+        if not connection or "Upgrade" not in connection:
             return Request.process(self)
 
         if upgrade not in ("WebSocket", "websocket"):