Returns the ``Content-Type`` header to be used for this request.

        .. versionadded:: 3.1

def get_content_type(self) -> str:
        """Returns the ``Content-Type`` header to be used for this request.

        .. versionadded:: 3.1
        """
        assert self.absolute_path is not None
        mime_type, encoding = mimetypes.guess_type(self.absolute_path)
        # per RFC 6713, use the appropriate type for a gzip compressed file
        if encoding == "gzip":
            return "application/gzip"
        # As of 2015-07-21 there is no bzip2 encoding defined at
        # http://www.iana.org/assignments/media-types/media-types.xhtml
        # So for that (and any other encoding), use octet-stream.
        elif encoding is not None:
            return "application/octet-stream"
        elif mime_type is not None:
            return mime_type
        # if mime_type not detected, use application/octet-stream
        else:
            return "application/octet-stream"