ReverseProxySetupMonitor warning when using Gateway API HTTPRoute

[AFreiholtz]

Describe the bug

We decided to test the new option of using HTTPRoute. When exposing Jenkins using the Helm chart with Gateway API HTTPRoute (Envoy Gateway) instead of only Ingress, Jenkins shows the warning: "It appears that your reverse proxy set up is broken."

However, the installation appears to function correctly:

• UI works
• redirects work
• Jenkins URL is correctly configured
• authentication via Microsoft Entra ID works
• no incorrect redirects to internal URLs or HTTP

This suggests that the reverse proxy monitor may not correctly recognize Gateway API based setups.

Version of Helm and Kubernetes

- Helm: v3.18.6
- Kubernetes: 
Client Version: v1.34.1
Server Version: v1.33.8+rke2r1

Chart version

5.9.4

What happened?

1. Configure HTTPRoute:
  ingress:
    enabled: true
    apiVersion: "networking.k8s.io/v1"
    labels: {}
    annotations:
      ingress.kubernetes.io/ssl-redirect: "true"
      cert-manager.io/cluster-issuer: letsencrypt
    ingressClassName: nginx
    hostName: 'our-url-redacted'
    tls:
    - secretName: test-env-jenkins-tls
      hosts:
      - 'our-url-redacted'

  # Gateway API HTTPRoute
  httpRoute:
    enabled: true
    apiVersion: "gateway.networking.k8s.io/v1"
    kind: HTTPRoute
    parentRefs:
      - name: shared-gateway
        namespace: envoy-gateway-system
        sectionName: https-public
    reuseIngressConfiguration: false
    hostnames:
      - 'our-url-redacted'
    extraRules: []
    # -- HTTPRoute annotations
    annotations: {}
2. Update helm chart with version 5.9.4
3. Browse Manage Jenkins, warning appears

What you expected to happen?

No warning present.

How to reproduce it

Anything else we need to know?

No response

[LeoQuote]

This problem relates to your gateway implement, you should dig into that rather than the helm manifest.

Free tip: blue ocean requires urlencode for slashes, read more at: https://plugins.jenkins.io/blueocean-web/#plugin-content-running-behind-a-proxy-read-this

[LeoQuote]

Helm charts are just templates. If the rendered output meets your needs, they're working as intended. If something doesn't behave as expected, consult the CRD/controller documentation or report the issue in the relevant project. Avoid blaming the template engine itself—it’s simply a tool.