async def websocket_accept(self, message, stream_name):
is_first = not self.applications_accepting_frames<EOL>self.applications_accepting_frames.add(stream_name)<EOL>if is_first:<EOL><INDENT>await self.accept()<EOL><DEDENT>
Intercept downstream `websocket.accept` message and thus allow this upsteam application to accept websocket
frames.