Format response using appropriate datamapper.

        Take the devil response and turn it into django response, ready to
        be returned to the client.

def _format_response(self, request, response):
        """ Format response using appropriate datamapper.

        Take the devil response and turn it into django response, ready to
        be returned to the client.
        """

        res = datamapper.format(request, response, self)
        # data is now formatted, let's check if the status_code is set
        if res.status_code is 0:
            res.status_code = 200
        # apply headers
        self._add_resposne_headers(res, response)
        return res