async def respond_with_responder( request: Request, responder: "Optional[Responder]", media_type: str, file_size: Optional[int], upload_name: Optional[str] = None, ) -> None: """Responds to the request with given responder. If responder is None then returns 404. Args: request responder media_type: The media/content type. file_size: Size in bytes of the media. If not known it should be None upload_name: The name of the requested file, if any. """ if request._disconnected: logger.warning( "Not sending response to request %s, already disconnected.", request) return if not responder: respond_404(request) return logger.debug("Responding to media request with responder %s", responder) add_file_headers(request, media_type, file_size, upload_name) try: with responder: await responder.write_to_consumer(request) except Exception as e: # The majority of the time this will be due to the client having gone # away. Unfortunately, Twisted simply throws a generic exception at us # in that case. logger.warning("Failed to write to consumer: %s %s", type(e), e) # Unregister the producer, if it has one, so Twisted doesn't complain if request.producer: request.unregisterProducer() finish_request(request)