 
  How to Return Custom Response Headers with Nginx Ingress in Kubernetes
This is useful when you want to check which Ingress is responding among multiple Ingresses.
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ...
  namespace: ...
  annotations:
    nginx.ingress.kubernetes.io/configuration-snippet: |
      more_set_headers "X-Ingress-Name: my-awesome-ingress";
      more_set_headers "X-Other-header: other-header";
spec: