Send the request to get raw content.

def _request_raw_content(self, url, timeout):
        """
        Send the request to get raw content.
        """

        request = Request(url)

        if self.referer is not None:
            request.add_header('Referer', self.referer)

        raw_xml = self._call_geocoder(
            request,
            timeout=timeout,
            deserializer=None
        )

        return raw_xml