forward-auth
user -> ingress -> backend service
user -> ingress -> forward auth service
                <- forward auth service
                -> backend service 

X-Forward-[] 헤더들과 cookie 를 가지고 인증을 앞단에서 선 처리

traefik tutorial

[URL]https://geek-cookbook.funkypenguin.co.nz/docker-swarm/traefik-forward-auth/



[URL]https://radarr.example.com/_oauth
[URL]https://radarr.example.com/_oauth
link

traefik
ingress