what is traefik-forward-auth fr?

Traefik Forward Auth adds a Google-style "Sign in with your company email" screen in front of any web app you run behind the Traefik reverse proxy. Instead of building login pages and password databases into every internal tool your team uses, you set this up once and let Traefik block unauthorized visitors before they ever reach the app. Traefik is a traffic router that sits in front of your services. This tool acts as a checkpoint that Traefik consults on every incoming request. If a visitor isn't authenticated, the tool redirects them to an OAuth provider (Google, or any OpenID Connect system like Azure or GitHub) to sign in. Once the provider confirms their identity, the tool sets a cookie and Traefik lets the request through to your app. You can restrict access to specific email domains or individual addresses, and a single login can persist across multiple subdomains. A startup founder running internal dashboards on metrics.example.com and chat.example.com would use this to ensure only their employees can access those tools, without writing any auth code. A PM setting up a preview environment for a new feature could put it behind this gate to share securely with stakeholders. It is designed for teams that self-host apps and want single sign-on without building it from scratch. The project is notable for its flexibility: it supports multiple authentication providers, can operate across multiple domains simultaneously, and lets you define rules so auth is selectively applied (for example, requiring login for an admin panel but allowing public access to a marketing page). The README is detailed about configuration options but assumes familiarity with Traefik and deployment environments like Docker Swarm or Kubernetes, so expect a learning curve if those are new to you.