def init_original_response(self):
        """Get the original response for comparing, confirm ``is_cookie_necessary``"""
        if 'json' in self.request:
            self.request['data'] = json.dumps(self.request.pop('json')).encode(
                self.encoding)
        r1 = self.req.request(
            retry=self.retry, timeout=self.timeout, **self.request)
        resp = r1.x
        assert resp, ValueError(
            'original_response should not be failed. %s' % self.request)
        self.encoding = self.encoding or resp.encoding
        self.original_response = self.ensure_response(r1)
        return self.original_response
Get the original response for comparing, confirm ``is_cookie_necessary``