code: private void checkResponse(ResponseDTO response) throws Throwable {
          if (response == null) {
              throw new RpcException("Response should not be null");
          }
  
          if (response.getError() != null) {
              throw response.getError().getCause();
          }
      }
docs: 检查reponse是否有异常情况，有则抛出异常
  
  @param response
  @throws Throwable