Method write_headers

python/python3/tornado/httputil.py:569–591

Write an HTTP header block. :arg start_line: a `.RequestStartLine` or `.ResponseStartLine`. :arg headers: a `.HTTPHeaders` instance. :arg chunk: the first (optional) chunk of data. This is an optimization so that small responses can be written in the same call a

(
        self,
        start_line: Union["RequestStartLine", "ResponseStartLine"],
        headers: HTTPHeaders,
        chunk: Optional[bytes] = None,
    )

    """

    def write_headers(
        self,
        start_line: Union["RequestStartLine", "ResponseStartLine"],
        headers: HTTPHeaders,
        chunk: Optional[bytes] = None,
    ) -> "Future[None]":
        """Write an HTTP header block.

        :arg start_line: a `.RequestStartLine` or `.ResponseStartLine`.
        :arg headers: a `.HTTPHeaders` instance.
        :arg chunk: the first (optional) chunk of data.  This is an optimization
            so that small responses can be written in the same call as their
            headers.

        The ``version`` field of ``start_line`` is ignored.

        Returns a future for flow control.

        .. versionchanged:: 6.0

           The ``callback`` argument was removed.
        """
        raise NotImplementedError()

    def write(self, chunk: bytes) -> "Future[None]":
        """Writes a chunk of body data.