Goxiaoy opened a new issue #74:
URL: https://github.com/apache/apisix-go-plugin-runner/issues/74
### Issue description
```
w http.ResponseWriter, r pkgHTTP.Request
r.RespHeader().Add("Set-Cookie","a=a; Expires=Wed, 21 Oct 2023 07:28:00 GMT;
Secure; HttpOnly")
r.RespHeader().Add("Set-Cookie","b=b; Expires=Wed, 21 Oct 2023 07:28:00 GMT;
Secure; HttpOnly")
```
Cookie `a` is missing in the response header
Workaround
Concat resp header before return
```
w http.ResponseWriter, r pkgHTTP.Request
r.RespHeader().Add("Set-Cookie","a=a; Expires=Wed, 21 Oct 2023 07:28:00
GMT; Secure; HttpOnly")
r.RespHeader().Add("Set-Cookie","b=b; Expires=Wed, 21 Oct 2023 07:28:00
GMT; Secure; HttpOnly")
if len(r.RespHeader().Values("Set-Cookie")) > 0 {
r.RespHeader().Set("Set-Cookie",
strings.Join(r.RespHeader().Values("Set-Cookie"), "; "))
}
```
### Environment
* APISIX Go Plugin Runner's version: dee7fa0167af0ed8cdcd87d4321a43b194f2a7ed
* APISIX version: 2.13.0
* Go version: 1.18
* OS (cmd: `uname -a`): centos
### Minimal test code / Steps to reproduce the issue
1. Start APISIX on docker
2. Set Plugin filter codes
```
Filter(conf interface{}, w http.ResponseWriter, r pkgHTTP.Request)
{
r.RespHeader().Add("Set-Cookie","a=a; Expires=Wed, 21 Oct 2023 07:28:00
GMT; Secure; HttpOnly")
r.RespHeader().Add("Set-Cookie","b=b; Expires=Wed, 21 Oct 2023 07:28:00
GMT; Secure; HttpOnly")
return
}
```
4. Cookie `a` is missing in the response header
### What's the actual result? (including assertion message & call stack if
applicable)
Cookie `b` can be found, Cookie `a` is missing
### What's the expected result?
Both cookie `a` and `b` could be found
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