Unable to redirect to the original host

[adrdra]

Hello there!

I am trying to use this project instead of https://github.com/thomseddon/traefik-forward-auth. I succeed to do the connection with my oauth provider, but I am always been redirected to the auth host instead of the origin host.

I have:

1. traefik as reverse proxy
2. A web service
3. A traefik-auth running on the current project

I need to protect some routes of my web service with traefik-auth.

Current Behavior

When accessing a protected endpoint (e.g., service.example.com/health), the authentication flow incorrectly redirects users to oauth.example.com/health after successful authentication instead of returning to the original URL.

Expected Behavior

After successful OAuth authentication, users should be redirected back to their original requested URL:

1. Initial request to service.example.com/health
2. Redirect to OAuth provider for authentication
3. Return to auth callback endpoint
4. Final redirect back to service.example.com/health

Configuration

1. traefik-auth

services:
  traefik-auth:
    build:
      context: .
      dockerfile: Dockerfile
    env_file: .env
    depends_on:
      - traefik
    labels:
      - traefik.enable=true
      - traefik.http.routers.traefik-auth-tls.entrypoints=https
      - traefik.http.routers.traefik-auth-tls.tls=true
      - traefik.http.routers.traefik-auth-tls.rule= Host(`oauth.example.com`)
      - traefik.http.routers.traefik-auth.entrypoints=http
      - traefik.http.services.traefik-auth.loadbalancer.server.port=4181
      - traefik.http.middlewares.forward-auth.forwardauth.address=http://traefik-auth:4181
      - traefik.http.middlewares.forward-auth.forwardauth.trustForwardHeader=true
      - traefik.http.middlewares.forward-auth.forwardauth.authResponseHeaders=X-Forwarded-User
      - traefik.http.routers.traefik-auth-tls.middlewares=forward-auth

2. service

services:
  service:
    build:
      context: .
      dockerfile: Dockerfile
    env_file: env
    depends_on:
      - postgres
      - traefik
    labels:
      - traefik.enable=true
      - traefik.http.routers.service.entrypoints=http
      - traefik.http.routers.service-tls.entrypoints=https
      - traefik.http.routers.service-tls.tls=true
      - traefik.http.routers.service.middlewares=forward-auth

Thanks for your help.