#169: fix returning 'ws' for location even when the client connects v…

…ia 'wss'

lib/socket.io/transports/websocket.js

@@ -33,7 +33,7 @@ WebSocket.prototype._onConnect = function(req, socket){
   }
 
   var origin = this.request.headers.origin,
-      location = (origin && origin.substr(0, 5) == 'https' ? 'wss' : 'ws')
+      location = (this.request.socket.encrypted ? 'wss' : 'ws')
                + '://' + this.request.headers.host + this.request.url;
 
   this.waitingForNonce = false;