version: '3.8'

services:

  app:
    command:
      - --providers.docker
      - --experimental.plugins.staticresponse.modulename=github.com/jdel/staticresponse
      - --experimental.plugins.staticresponse.version=v0.0.1
    deploy:
      labels:
        # custom traefik errors
        - "traefik.http.middlewares.web-secure.errors.status=400-599"
        - "traefik.http.middlewares.web-secure.errors.service=down-rule"
        - "traefik.http.middlewares.web-secure.errors.query=/traefik-http-error/{status}"
        # catchall rule
        - "traefik.http.routers.http-catchall.entrypoints=web-secure"
        - "traefik.http.routers.http-catchall.rule=PathPrefix(`/`)"
        # lowest possible priority, evaluated when no other router is matched
        - "traefik.http.routers.http-catchall.priority=1"
        - "traefik.http.routers.http-catchall.middlewares=503down"
        # static error message
        - "traefik.http.middlewares.503down.plugin.staticresponse"
        - "traefik.http.middlewares.503down.plugin.staticresponse.StatusCode=503"
        - "traefik.http.middlewares.503down.plugin.staticresponse.Body=Sorry, currently under maintenance. Please try again later."
        # error page
        - "traefik.http.routers.down-rule.rule=PathPrefix(`/traefik-http-error`)"
        - "traefik.http.routers.down-rule.service=noop@internal"
        - "traefik.http.routers.down-rule.entrypoints=web-secure"
        - "traefik.http.routers.down-rule.middlewares=503down"