kubernetes-guide/docs/chap16/16.7.md

**vim laptop-ingress.yaml**

```
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/server-snippet: |
      set $agentflag 0;
              if ($http_user_agent ~* "(Android|iPhone|Windows Phone|UC|Kindle)" ){
                set $agentflag 1;
              }
              if ( $agentflag = 1 ) {
                return 301 http://m.test.com;
              }
  name: laptop
  namespace: study-ingress
spec:
  ingressClassName: nginx
  rules:
  - host: test.com
    http:
      paths:
      - backend:
          service:
            name: laptop
            port:
              number: 80
        path: /
        pathType: ImplementationSpecific

```