docs: def create_307_response(self):
          """
          Creates a 307 "Temporary Redirect" response including a HTTP Warning
          header with code 299 that contains the user message received during
          processing the request.
          """
          request = get_current_request()
          msg_mb = UserMessageMember(self.message)
          coll = request.root['_messages']
          coll.add(msg_mb)
          # Figure out the new location URL.
          qs = self.__get_new_query_string(request.query_string,
                                           self.message.slug)
          resubmit_url = "%s?%s" % (request.path_url, qs)
          headers = [('Warning', '299 %s' % self.message.text),
  #                       ('Content-Type', cnt_type),
                     ]
          http_exc = HttpWarningResubmit(location=resubmit_url,
                                         detail=self.message.text,
                                         headers=headers)
          return request.get_response(http_exc)