Traefik-route-k8s renders rules without `stripPrefix` middleware

[natalian98]

Bug Description

The traefik-route-k8s doesn't generate rules with the stripPrefix middleware, while the "ingress-per-app" does so. Is this intentional? Is that middleware not needed with ingress-per-unit?

An example rule rendered by

• route charm:

  http:
  routers:
  juju-prometheus-k8s-0-test-router:
    entryPoints:
    - web
    rule: Host(`prometheus-k8s-operator-0.prometheus-k8s-operator-endpoints.test.svc.cluster.local`)
    service: juju-prometheus-k8s-0-test-service
  juju-prometheus-k8s-0-test-router-tls:
    entryPoints:
    - websecure
    rule: Host(`prometheus-k8s-operator-0.prometheus-k8s-operator-endpoints.test.svc.cluster.local`)
    service: juju-prometheus-k8s-0-test-service
    tls:
      domains:
      - main: 10.64.140.43
        sans:
        - '*.10.64.140.43'
  services:
  juju-prometheus-k8s-0-test-service:
    loadBalancer:
      servers:
      - url: http://prometheus-k8s-operator-0.prometheus-k8s-operator-endpoints.test.svc.cluster.local:8080

• ingress-per-app:

  http:
  middlewares:
  juju-sidecar-noprefix-test-identity-platform-login-ui-operator:
    stripPrefix:
      forceSlash: false
      prefixes:
      - /test-identity-platform-login-ui-operator
  routers:
  juju-test-identity-platform-login-ui-operator-router:
    entryPoints:
    - web
    middlewares:
    - juju-sidecar-noprefix-test-identity-platform-login-ui-operator
    rule: PathPrefix(`/test-identity-platform-login-ui-operator`)
    service: juju-test-identity-platform-login-ui-operator-service
  juju-test-identity-platform-login-ui-operator-router-tls:
    entryPoints:
    - websecure
    rule: PathPrefix(`/test-identity-platform-login-ui-operator`)
    service: juju-test-identity-platform-login-ui-operator-service
    tls:
      domains:
      - main: 10.64.140.43
        sans:
        - '*.10.64.140.43'
  services:
  juju-test-identity-platform-login-ui-operator-service:
    loadBalancer:
      servers:
      - url: http://identity-platform-login-ui-operator-0.identity-platform-login-ui-operator-endpoints.test.svc.cluster.local:8080

To Reproduce

1. juju deploy traefik-route-k8s root_url=...
2. juju deploy traefik-k8s
3. juju deploy prometheus-k8s
4. juju relate traefik-route-k8s prometheus-k8s
5. juju relate traefik-route-k8s traefik-k8s

Environment

n/a

Relevant log output

n/a

Additional context

No response

[simskij]

The middleware is not strictly needed in any routing mode. However, it often makes a lot of sense to have it to simplify reverse proxying. I just think no one has asked for this middleware to be available in the route charm, so no time has been invested in adding it.

[sed-i]

Related (for future reference): https://github.com/canonical/grafana-k8s-operator/pull/246

[PietroPasotti]

@natalian98 can you try out https://github.com/canonical/traefik-route-k8s-operator/pull/47 ?