socketio/virtsocket.py
def _save_ack_callback(self, msgid, callback):
        """Keep a reference of the callback on this socket."""
        if msgid in self.ack_callbacks:
            return False
        self.ack_callbacks[msgid] = callback
def _save_ack_callback(self, msgid, callback):
        """Keep a reference of the callback on this socket."""
        if msgid in self.ack_callbacks:
            return False
        self.ack_callbacks[msgid] = callback
Keep a reference of the callback on this socket.