Let's build a CDN 2

This is a follow-up to https://makeitwork.tv/lets-build-a-cdn-1/

• We made IAD the primary region (it's the closest one to the origin)
• Discussed VARNISH_SIZE
• Exposed environment variables as custom HTTP headers
• Struggled with IPv6 DNS resolution

In the end, we were surprised by something that started working all of a sudden.

👇 Full-length movie + media server info