I've a php application in a docker container deployed on my Kubernetes cluster. The application redirects from / to another directory, let's say /example (it's the same application, the application just uses another "root"-directory).

I'm using ambassador as ingress controller. Unfortunately, after the redirect ambassador says "no healthy upstream". Since I'm getting redirected, ambassador is able to find my application, but it cannot find my application anymore after the redirect. My ingress looks like:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
  annotations:
    kubernetes.io/ingress.class: ambassador
    cert-manager.io/issuer: letsencrypt-prod
spec:
  rules:
  - host: sub.some-domain.tld
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: myservice
            port:
              number: 80
  tls:
  - hosts:
    - sub.some-domain.tld
    secretName: acme-crt-secret

I expected that, when I get redirected from https://sub.some-domain.tld/ to https://sub.some-domain.tld/example, ambassador forwards the request to the ingress above, but obviously ambassador doesn't associate https://sub.some-domain.tld/exmaple with my ingress. Any ideas how I can solve this issue?