Method _parse_extensions_header

tornado/websocket.py:975–981

(
        self, headers: httputil.HTTPHeaders
    )

        await self._receive_frame_loop()

    def _parse_extensions_header(
        self, headers: httputil.HTTPHeaders
    ) -> List[Tuple[str, Dict[str, str]]]:
        extensions = headers.get("Sec-WebSocket-Extensions", "")
        if extensions:
            return [httputil._parse_header(e.strip()) for e in extensions.split(",")]
        return []

    def _process_server_headers(
        self, key: Union[str, bytes], headers: httputil.HTTPHeaders