To enable CORS in ingress, add the following:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
...
nginx.ingress.kubernetes.io/enable-cors: "true"
nginx.ingress.kubernetes.io/cors-allow-methods: "PUT, GET, POST, OPTIONS"
nginx.ingress.kubernetes.io/cors-allow-origin: "*"
nginx.ingress.kubernetes.io/cors-allow-credentials: "true"
* – allows requests from anywhere, replace it with the domain you need