Method _break_cycles

python/python3/tornado/websocket.py:577–584

(self)

        self.on_connection_close()

    def _break_cycles(self) -> None:
        # WebSocketHandlers call finish() early, but we don't want to
        # break up reference cycles (which makes it impossible to call
        # self.render_string) until after we've really closed the
        # connection (if it was established in the first place,
        # indicated by status code 101).
        if self.get_status() != 101 or self._on_close_called:
            super()._break_cycles()

    def get_websocket_protocol(self) -> Optional["WebSocketProtocol"]:
        websocket_version = self.request.headers.get("Sec-WebSocket-Version")