k8s ingress 跨域问题

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      if ($request_method = 'OPTIONS') {
        add_header 'Access-Control-Max-Age' 1728008;
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Headers' '*';
        add_header 'Access-Control-Allow-Methods' 'GET,POST,PUT,DELETE,PATCH,OPTIONS';
        return 200;
       }
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/cors-allow-credentials: "true"
    nginx.ingress.kubernetes.io/cors-allow-headers: DNT,web-token,app-token,Authorization,Accept,Origin,Keep-Alive,User-Agent,X-Mx-ReqToken,X-Data-Type,X-Auth-Token,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,token,Cookie
    nginx.ingress.kubernetes.io/cors-allow-methods: PUT, GET, POST, OPTIONS
    nginx.ingress.kubernetes.io/cors-allow-origin: '*'
    nginx.ingress.kubernetes.io/enable-cors: "true"
    nginx.ingress.kubernetes.io/proxy-body-size: 300m
  name: flaskdemo
  namespace: {{NAMESPACE}}
spec:
  rules:
  - host: {{INGRESS_FLASKDEMO}}
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: flaskdemo
            port:
              number: 5000