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Using an ingress for rewriting rules is very inadapted. if you with to use an automatic load balancer, i've acheived something sililar with apache

RequestHeader set X-Forwarded-Proto "https"
RequestHeader set X-Original-URL expr=%{REQUEST_SCHEME}://%{HTTP_HOST}%{REQUEST_URI}
RewriteCond %{REQUEST_URI} ^/([^/]+)/(.*)$
RewriteRule ^/([^/]+)/(.*)$ http://%1/$2 [P,QSA,L]

Retirecting http://domain.com/foo/bar to http://foo/bar internally It works-ish but caused a whole lot of issues

sorry isn't possible to use load balancer apache, and really don't understand, just need to adapte the ingress only

then try this (untested) :

apiVersion: <http://networking.k8s.io/v1|networking.k8s.io/v1>
kind: Ingress
metadata:
  name: app-ingress
  annotations:
    <http://nginx.ingress.kubernetes.io/rewrite-target|nginx.ingress.kubernetes.io/rewrite-target>: /$2
    <http://nginx.ingress.kubernetes.io/use-regex|nginx.ingress.kubernetes.io/use-regex>: "true"
spec:
  rules:
  - http:
      paths:
      - path: /([^/]+)/(.+)
        pathType: Prefix
        backend:
          service:
            name: $1
            port:
              number: 80

yes but I don't want that the webbrowser will redirect to http://foo/bar but kept on http://website/foo/bar but send request to the pod at /foo/bar

Thats not what will happen

we use that for the moment apiVersion: networking.k8s.io/v1 kind: Ingress metadata: annotations: meta.helm.sh/release-name: simenv meta.helm.sh/release-namespace: simenv nginx.ingress.kubernetes.io/add-base-url: "true" nginx.ingress.kubernetes.io/backend-protocol: HTTP nginx.ingress.kubernetes.io/configuration-snippet: | proxy_set_header Accept-Encoding ""; # sub_filter needs disabled compression sub_filter_once on; sub_filter '<base href="/env-rest-api"' '<base href="/mourmelon/"'; nginx.ingress.kubernetes.io/enable-rewrite-log: "true" nginx.ingress.kubernetes.io/rewrite-target: /env-rest-api/$1 nginx.ingress.kubernetes.io/ssl-passthrough: "true" nginx.ingress.kubernetes.io/use-regex: "true" creationTimestamp: "2024-05-07T091721Z" generation: 1 labels: app.kubernetes.io/managed-by: Helm name: env-api-ingress-mourmelon namespace: simenv resourceVersion: "5321396" uid: 96c4041b-a2ab-45b1-972e-f2753b347983 spec: ingressClassName: nginx rules: - http: paths: - backend: service: name: simenv-env-api-service-mourmelon port: number: 12001 path: /mourmelon/env-rest-api/(.*) pathType: ImplementationSpecific status: loadBalancer: ingress: - ip: 10.11.2.44

The rewrite would be internally i think