Support for ExtensionRef HTTPRoute filter type

[w32-blaster]

Hi,

It would be useful if the GKE gateway API implementation would be able to support the ExtensionRef filter type. This could be used to implement custom authentication mechanism on the httproute level.

More details about this filter type here: https://gateway-api.sigs.k8s.io/reference/spec/#gateway.networking.k8s.io%2fv1.HTTPRouteFilterType

[briantkennedy]

Hi @w32-blaster which GCP Cloud Load Balancer feature are you looking to configure? Any docs references would be helpful.

Thanks,
Brian