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

[LiebeKrake]

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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)

在consumer端拿不到的“key”的值，请问应该怎么在provider端向consumer端回传隐式参数？
（因为某些特殊原因，暂时只能使用dubbo2）

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[AlbumenJ]

Please re-submit the discussion in English :)