Google Cloud just release a new feature today which allows you to redirect traffic to different storage buckets and even compute VM instances using simple rules which are themselves stored in a storage bucket.

See: https://cloud.google.com/compute/docs/load-balancing/http/using-http-lb-with-cloud-storage?utm_source=release-notes&utm_medium=email&utm_campaign=2017-March-release-notes-1-en