The client cannot obtain the attachment set by the server

[ziyyun]

Environment

• Server: Dubbo-go, v3.3.0
• Client: Dubbo-go, v3.3.0
• Protocol: Triple
• Registry: zookeeper

Issue description

Server:

result := invoker.Invoke(ctx, invocation) result.AddAttachment("code", zcode.CODE_SUCCESS) return result

Client:

result := invoker.Invoke(ctx, invocation) _, ok := result.Attachments()["code"]

The client cannot obtain the attachment. I didn't see response with attachment in the source code.

[ziyyun]

发现开发分支有一个提交和这个问题相关 #2854 ，但无法保证新老版本一致性，无法满足https://github.com/apache/dubbo-go-samples/tree/main/compatibility/filter/custom ，使用上也偏复杂。

[ziyyun]

已提交修改 #2927

[marsevilspirit]

Thanks!