Next line returns 200 as status https://github.com/Kong/kong/blob/c817fada7a514d84f6e0aab7461605c71bf3a841/kong/plugins/cors/handler.lua#L13

Internet says it should return 204:

• https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request
• https://docs.microsoft.com/en-us/aspnet/core/security/cors?view=aspnetcore-3.1#preflight-requests

Internet changed its mind since 2018 https://

Since maxmind no longer provides the legacy GeoIP databases could it might be possible to update the nxtool to use GeoIP2?

Here is a FAQ(How APISIX use etcd to update the configuration in milliseconds) in Chinese.

APISIX利用etcd如何实现毫秒级别的配置同步

etcd提供接口wait、waitdir接口用于监听指定关键字、目录是否发生变更，如果发生变更，返回更新的数据。

以waitdir接口为例：
syntax: res, err = cli:waitdir(dir:string [, modified_index:uint [, timeout:uint] ])
其中timeout参数表示调用进程和etcd长连接的时间，值为0时表示无长连接。

APISIX关于etcd长连接时间的配置如下：

etcd:
  host:                          

We'd like to make sure flagger is there if there's some contention. Also please add this to the loadtester chart