How to build a 30M RPS CDN in 30 days with Rust and WASM

Author: Phin Walton Railway has technically ran an “edge” network for over 3 years, although it didn’t really live up to the “edge” name - it ran on our 4 Railway regions across the world, nowhere near 100+ POPs you expect when thinking about edge computing. However, starting this week, the CDN we built (which served you this very page!) is becoming available to all Railway customers at the click of a button. This is the story of how we built a modern CDN: why we had to build it ourselves, how B