I'm trying to get a GKE ingress to require basic auth like this example from github.

The ingress works fine. It routes to the service. But the authentication isn't working. Allows all traffic right through. Has GKE not rolled this feature out yet? Something obviously wrong in my specs?

Here's the ingress:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: super-ingress
  annotations:
    ingress.kubernetes.io/auth-type: basic
    ingress.kubernetes.io/auth-secret: basic-auth
    ingress.kubernetes.io/auth-realm: "Authentication Required"
spec:
  rules:
  - host: zzz.host.com
    http:
      paths:
      - backend:
          serviceName: super-service
          servicePort: 9000
        path: /*

And the basic-auth secret:

$ kubectl get secret/basic-auth -o yaml

apiVersion: v1
data:
  auth: XXXXXXXXXXXXXXXXXXX
kind: Secret
metadata:
  creationTimestamp: 2016-10-03T21:21:52Z
  name: basic-auth
  namespace: default
  resourceVersion: "XXXXX"
  selfLink: /api/v1/namespaces/default/secrets/basic-auth
  uid: XXXXXXXXXXX
type: Opaque

Any insights are greatly appreciated!