docs: 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