Undo changes from `_apply_xheaders`.

        Xheaders are per-request so they should not leak to the next
        request on the same connection.

def _unapply_xheaders(self) -> None:
        """Undo changes from `_apply_xheaders`.

        Xheaders are per-request so they should not leak to the next
        request on the same connection.
        """
        self.remote_ip = self._orig_remote_ip
        self.protocol = self._orig_protocol