Method once_web_socket_connection

tests/server.py:280–283

(
        self, handler: Callable[["WebSocketProtocol"], None]
    )

        self.once_web_socket_connection(lambda ws: ws.sendMessage(data))

    def once_web_socket_connection(
        self, handler: Callable[["WebSocketProtocol"], None]
    ) -> None:
        self._ws_handlers.append(handler)


class HTTPServer(Server):