Let's build a CDN - Part 2

This is a follow-up to https://www.youtube.com/watch?v=8bDgWvyglno Most of this is captured in 🐙 https://github.com/thechangelog/changelog.com/pull/518 We made IAD the primary region (it's the closest one to the origin), discussed VARNISH_SIZE and exposed environment variables as custom HTTP headers. We then struggle with IPv6 DNS resolution. At the end, we are surprised when this starts working all of a sudden. Listen to the conversation before the screen share 🎧 https://makeitwork.fm/10 If you enjoyed this content and want to watch the full movie in 4k, go to 📺 https://makeitwork.tv. Offline download is available. 00:00 Intro 00:57 Who is James? 02:12 Who is Matt? 03:23 What are we trying to achieve today? 04:26 GitHub Pull Request 518 05:53 Make IAD the primary region 06:31 How do we think about VARNISH_SIZE? 09:43 Expose env var as custom HTTP header 12:15 503 backend fetch failed 22:59 We could create a GitHub issue... 24:27 Why does this work?