title: How can I put basic auth on specific HTTP methods in ngnix ingress?
body: <p>I can create ingress with basic auth. I followed the template from kubernetes/ingress-nginx:</p>
  
  <pre><code>apiVersion: extensions/v1beta1
  kind: Ingress
  metadata:
    name: ingress-with-auth
    annotations:
      # type of authentication
      nginx.ingress.kubernetes.io/auth-type: basic
      # name of the secret that contains the user/password definitions
      nginx.ingress.kubernetes.io/auth-secret: basic-auth
      # message to display with an appropriate context why the authentication is required
      nginx.ingress.kubernetes.io/auth-realm: 'Authentication Required - foo'
  spec:
    rules:
    - host: foo.bar.com
      http:
        paths:
        - path: /
          backend:
            serviceName: http-svc
            servicePort: 80
  </code></pre>
  
  <p>It works fine, but I need to allow 'OPTIONS' method without basic auth for pre-flight requests. Any pointers on how to do it will be very helpful.</p>