aiyiyi121 opened a new issue, #7255:
URL: https://github.com/apache/apisix/issues/7255
### Description
```
if conf.allow_headers == "**" then
core.response.set_header("Access-Control-Allow-Headers",
core.request.header(ctx, "Access-Control-Request-Headers"))
else
core.response.set_header("Access-Control-Allow-Headers",
conf.allow_headers)
end
```
I'm confused，why set the response header `Access-Control-Allow-Headers` as
`Access-Control-Request-Headers` when ’allow_headers‘ is ‘**’. If the value of
`Access-Control-Request-Headers` is null, the value of
`Access-Control-Allow-Headers` will be null too, and then leads to problems
### Environment
- APISIX version (run `apisix version`): 2.10
- Operating system (run `uname -a`):
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`):
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):
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