def StreamingInputCall(self, request_iter, unused_rpc_context):
        response = self._responses_pb2.StreamingInputCallResponse()
        aggregated_payload_size = 0
        for request in request_iter:
            aggregated_payload_size += len(request.payload.payload_compressable)
        response.aggregated_payload_size = aggregated_payload_size
        self._control()
        return response