An example of an ingress setup for a gateway on an nginx ingress on kubernetes.

gateway-example.ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/configuration-snippet: |
      if ($http_env = "dev") { proxy_pass http://<service-name>.<service-namespace>.svc.cluster.local:<service-port>; } # Point directly to a service in the same cluster
      if ($http_env = "staging") { proxy_pass https://staging.example.com; } # Or point to a URL
  name: gateway
  namespace: default
  # Continue as usual pointing to the default service
  ...