[GitHub] [dubbo] guohao commented on issue #8363: [Dubbo 3.0.1] use triple protocol cant return real exception

[GitBox <gi...@apache.org>]

guohao commented on issue #8363:
URL: https://github.com/apache/dubbo/issues/8363#issuecomment-897533563


   Scenario1 :  Non-Protobuf
   Exception will be serialized and rethrowed at client side.
   Scenario2 : Protobuf
   Serialization of origin exception is not supported, insteadly  a `TripleRpcException` will be returned. Users can return and get custom error code in response's attachments like this
   ```java
   @Activate(group = {CommonConstants.CONSUMER})
   public class BizErrorCodeClientFilter implements ClusterFilter, BaseFilter.Listener {
       @Override
       public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
           return invoker.invoke(invocation);
       }
   
       @Override
       public void onResponse(Result appResponse, Invoker<?> invoker, Invocation invocation) {
           appResponse.getObjectAttachment("biz-err-code");
       }
   
       @Override
       public void onError(Throwable t, Invoker<?> invoker, Invocation invocation) {
       }
   }
   ```


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