Looks like perhaps an issue with Google Load Balancer. We have a load balancer in front of Google Storage Buckets, and can access resources directly from the buckets, but getting 404 when going through the load balancer.
Non-engineer here - Is there an easy way to multi-provider redundancy around this? Can you have LBs on multiple clouds and use dns to move around or something? Or does your LB have to be at the provider the app is at? Sorry if this makes no sense. :o