kubernetes-nginx-multi-domain-cors.yaml

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: foo
  annotations:
    kubernetes.io/ingress.class: "nginx"
    cert-manager.io/cluster-issuer: "letsencrypt-prod"
    nginx.ingress.kubernetes.io/configuration-snippet: |
      if ($http_origin ~* "^https?://((?:www\.exactmatch\.com)|(?:.*\.regexmatch\.com))$") {
        set $cors "true";
      }
      if ($request_method = 'OPTIONS') {
        set $cors "${cors}options";
      }

      if ($cors = "true") {
        add_header 'Access-Control-Allow-Origin' "$http_origin" always;
        add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, PATCH, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization' always;
        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
      }

      if ($cors = "trueoptions") {
        add_header 'Access-Control-Allow-Origin' "$http_origin";
        add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, PATCH, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
        add_header 'Access-Control-Max-Age' 1728000;
        add_header 'Content-Type' 'text/plain charset=UTF-8';
        add_header 'Content-Length' 0;
        return 204;
      }