AlinsRan opened a new issue, #11325:
URL: https://github.com/apache/apisix/issues/11325
### Current Behavior
1. send a request with header `xtag: b`
```shell
curl http://127.0.0.1:9080/get -H "xtag: b"
```
2. accessing and updating header `xtag` in apisix.
After the update, when accessing the HTTP header `xtag` through ctx.var, it
was expected to receive `a` but received `b`
```lua
-- get: b
core.log.info("ctx.var.http_xtag: ", ctx.var.http_xtag)
-- set header, xtag = a
core.request.set_header(ctx, "xtag", "a")
-- get: b
-- expect: a
core.log.info("ctx.var.http_xtag: ", ctx.var.http_xtag)
```
As shown in the above example, when using ctx.var to retrieve the HTTP
header, once the value is cached, it will no longer be updated.
### Expected Behavior
When updating the HTTP header, the ctx.var cache will also be updated.
### Error Logs
_No response_
### Steps to Reproduce
1.
### Environment
- APISIX version (run `apisix version`): 3.9.0
- 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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