We have configured the kubernetes environment for our application. Which has one master, two slaves and nginx is using as a webserver. While access the url of our application, getting the cors error. I have followed kubernetes document(https://kubernetes.io/docs/tasks/access-application-cluster/connecting-frontend-backend/) for setting connection between backend and fronend, you can find all those details below. Here am not mentioning the full details of the yamls files and please let know if am missing anything.

This is the error am getting.

Access to XMLHttpRequest at 'http://andy.fin.com:9090/configuration/api/v1/configuration' from origin 'http://172.16.198.102:32603' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

#nginx configuration
upstream zuul {
    server zuul;
}
location / {
    proxy_pass http://andy.fin.com:9090/;
    proxy_redirect off;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto "http";
    proxy_set_header Origin "http://localhost:32603";
    proxy_set_header Referer "http://localhost:32603";
    proxy_hide_header 'Access-Control-Allow-Origin';
  }

apiVersion: apps/v1
kind: Deployment
metadata:
  name: frontend
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: zuul
      tier: frontend
  replicas: 1 
  template: 
    metadata:
      labels:
        app: zuul
        tier: frontend
    spec:
      containers:
      - name: nginx
        image: nginx

---
apiVersion: v1
kind: Service
metadata:
  name: frontend
spec:
  selector:
    app: zuul
    tier: frontend
  ports:
  - protocol: "TCP"
    port: 80
    targetPort: 80
  type: LoadBalancer

apiVersion: apps/v1
kind: Deployment
metadata:
  name: zuul-routing
spec:
  selector:
     matchLabels:
       app: zuul
       tier: backend
  replicas: 1
  template:
    metadata:
      labels:
        app: zuul
        tier: backend
    spec:
      containers:
      - env:
---
apiVersion: v1
kind: Service
metadata:
  name: zuul
spec:
  selector:
    app: zuul
    tier: backend
  ports:
  - protocol: TCP
    port: 9090
    targetPort: http