def get_state_event(self, room_id, event_type):
        """Perform GET /rooms/$room_id/state/$event_type

        Args:
            room_id(str): The room ID.
            event_type (str): The type of the event.

        Raises:
            MatrixRequestError(code=404) if the state event is not found.
        """
        return self._send("GET", "/rooms/{}/state/{}".format(quote(room_id), event_type))