Errors Middleware + IngressRoute : Could not get Capture / value not found in context

[guyguy333]

Errors Middleware + IngressRoute : Could not get Capture / value not found in context

[hood]

Could you please provide a simple repro? I’d like to tackle this.

[guyguy333]

Could you please provide a simple repro? I’d like to tackle this.

Hi @hood,

Thanks for checking this issue. Yes sure. I did simplify code (https://api.github.com/user/emails was used to reproduce a 401). You can reproduce with this docker-compose. If you try to open traefik.localhost you should get the error (and so white page).

Please note that removing '--metrics.prometheus=true' arg does not reproduce the issue.

services:

  traefik:
    image: "traefik:v3.0.2"
    container_name: "traefik"
    command:
      - "--log.level=DEBUG"
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--entryPoints.web.address=:80"
      - '--accesslog=true'
      - '--ping=true'
      - '--metrics.prometheus=true'
      
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.dashboard.rule=Host(`traefik.localhost`) && PathPrefix(`/`)"
      - "traefik.http.routers.dashboard.service=api@internal"
      - "traefik.http.routers.dashboard.middlewares=testErrors@docker,testForwardAuth@docker"
      - "traefik.http.middlewares.testForwardAuth.forwardauth.address=https://api.github.com/user/emails"
      - "traefik.http.middlewares.testForwardAuth.forwardauth.trustForwardHeader=true"
      - "traefik.http.middlewares.testForwardAuth.forwardauth.authResponseHeaders=Authorization"
      - "traefik.http.middlewares.testErrors.errors.status=401-403"
      - "traefik.http.middlewares.testErrors.errors.service=whoami"
      - "traefik.http.middlewares.testErrors.errors.query=/?rd={url}"

  whoami:
    image: "traefik/whoami"
    container_name: "whoami"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.whoami.rule=Host(`whoami.localhost`)"
      - "traefik.http.routers.whoami.entrypoints=web"
      - "traefik.http.services.whoami.loadbalancer.server.port=80"

[farcaller]

I can reproduce it on traefik 3.0.2 in kubernetes. The actual error is from the capture middleware.