Method open

python/python3/tornado/websocket.py:399–413

Invoked when a new WebSocket is opened. The arguments to `open` are extracted from the `tornado.web.URLSpec` regular expression, just like the arguments to `tornado.web.RequestHandler.get`. `open` may be a coroutine. `on_message` will not be called until `op

(self, *args: str, **kwargs: str)

        return None

    def open(self, *args: str, **kwargs: str) -> Optional[Awaitable[None]]:
        """Invoked when a new WebSocket is opened.

        The arguments to `open` are extracted from the `tornado.web.URLSpec`
        regular expression, just like the arguments to
        `tornado.web.RequestHandler.get`.

        `open` may be a coroutine. `on_message` will not be called until
        `open` has returned.

        .. versionchanged:: 5.1

           ``open`` may be a coroutine.
        """
        pass

    def on_message(self, message: Union[str, bytes]) -> Optional[Awaitable[None]]:
        """Handle incoming messages on the WebSocket