2456868764 opened a new issue, #2641:
URL: https://github.com/apache/dubbo-go/issues/2641
### Environment
- Server: Dubbo-go, master
- Client: Dubbo-go, master
- Protocol: Triple
- Registry: N/A
### Issue description
server code
```
func (srv *GreetTripleServer) Greet(ctx context.Context, req
*greet.GreetRequest) (*greet.GreetResponse, error) {
resp := &greet.GreetResponse{Greeting: req.Name}
ctx = context.WithValue(ctx, constant.AttachmentKey,
map[string]interface{}{"server_info": "dubbo httpbin"})
return resp, nil
}
```
client code
```
ctx := context.Background()
resp, err := svc.Greet(ctx, &greet.GreetRequest{Name: "hello world"})
if err != nil {
c.JSON(http.StatusBadGateway, err.Error())
return
}
attachments := make(map[string]interface{})
if ctx.Value(constant.AttachmentKey) != nil {
attachments =
ctx.Value(constant.AttachmentKey).(map[string]interface{})
}
```
and found that client attachments is nil.
then use curl to simulate as http which return is follow:
````
(base) ➜ dubbo-go git:(feat-security) ✗ curl -v -H
"content-type:application/json" http://127.0.0.1:8000/greet.GreetService/Greet
-d '{"name":"hello"}'
* Trying 127.0.0.1:8000...
* Connected to 127.0.0.1 (127.0.0.1) port 8000 (#0)
> POST /greet.GreetService/Greet HTTP/1.1
> Host: 127.0.0.1:8000
> User-Agent: curl/8.1.2
> Accept: */*
> content-type:application/json
> Content-Length: 16
>
< HTTP/1.1 200 OK
< Accept-Encoding: gzip
< Content-Type: application/json
< Date: Fri, 22 Mar 2024 03:05:43 GMT
< Content-Length: 20
<
* Connection #0 to host 127.0.0.1 left intact
{"greeting":"hello"}%
no attachments return
````
### Logs
<details><summary>Click me to check logs</summary>
```
Copy logs to here.
```
</details>
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