[Q/A]How does provider response attachments to consumer in Dubbo2.7.18?

[LiebeKrake]

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• I am sure that all the content I provide is in English.

Apache Dubbo Component

Java SDK (apache/dubbo)

Details

provider：

public class MyGenericService implements GenericService {
public Object $invoke(String methodName, String[] parameterTypes, Object[] args) throws GenericException {
RpcContext serverContext = RpcContext.getServerContext();
serverContext.setAttachment("key","value");
return "xxxx";
}

consumer:

registryConfig.setAddress("N/A");
...
referenceConfig.setUrl("dubbo://localhost:8888");
referenceConfig.get().$invoke("echo", new String[]{"java.lang.String"}, new String[]{body});
RpcContext.getServerContext().getAttachment("key");

——————
My code snippet is shown above,
I cannot get the value of the attachment "key" on the consumer side. How should I return attachments from the provider to the consumer?
(For some special reasons, only dubbo2 can be used for the time being)

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[AlbumenJ]

The usage is OK and this might be a bug of 2.7.x. But 2.7.x is EOL now, we will not release a new version for 2.7.x.

Here are some advice for you if you want to know why.

1. Check org.apache.dubbo.rpc.filter.ContextFilter#onResponse in provider side whether set the attachments into appResponse
2. Check org.apache.dubbo.rpc.cluster.interceptor.ConsumerContextClusterInterceptor#onMessage in consumer side whether the appResponse contains the attachments and set to ServerContext success or not