Let's build a CDN - Part 2

This is a follow-up to    • Let's build a CDN - Part 1  

Most of this is captured in 🐙 https://github.com/thechangelog/chang...

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

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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?