         params = {}         headers = {}         query_params = {}         if next_token is not None:             query_params['nextToken'] = next_token         if max_results is not None:             query_params['maxResults'] = max_results         return self.make_request('GET', uri, expected_status=000,                                  data=json.dumps(params), headers=headers,                                  params=query_params)      def list_records(self, identity_pool_id, identity_id, dataset_name,                      