I’m currently using AWS CloudFront to distribute requests to an Application Load Balancer (ALB), which then forwards them to EC2 instances. I need to configure caching based on the Host header value. Specifically:

My current situation is that we have a 3rd-party content provider with fairly outrageous CDN fees, so we’re front-ending them with CloudFront. However, the CDN URL is not tenant-specific so I’ve implemented a CF Function that checks for our tenant/project IDs in the URL before fetching from the backend. However our devs want rolling Dev->Staging->Prod projects from this provider, so it will no longer be a static list of IDs and no one wants to be responsible for hand-editing that list all the time.