code: @Override
      public void sendSofaException(SofaRpcException sofaException) {
          checkState();
          SofaResponse response = new SofaResponse();
          response.setErrorMsg(sofaException.getMessage());
          sendSofaResponse(response, sofaException);
      }
docs: A->B(当前)->C的场景下，将远程服务端C的RPc异常异步返回给调用者A
  
  @see SofaResponseCallback#onSofaException(SofaRpcException, String, RequestBase)