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?

Issue description

set twice route in the same uri，the second response should not include “preNode”
curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
...
{"action":"set","node":{...},"prevNode":{...}}

Environment

• apisix version (cmd: apisix version): 1.5
• OS: centos7

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