Why this day matters: This is the deliverable that demonstrates 120 days of work. ~4000–6000 lines of Go, zero external dependencies, every component built from scratch using the standard library. This is the architecture of Cloudflare's edge, AWS WAF + ALB, and Fastly's compute platform — in one binary.
Background in this wiki: HTTPS guide Part 9 (the server side, built in Go); TCP/IP guide Part 13 (professional networking); Linux guide Ch 82 (shipping the service); OSI guide, Part 15. Security in Depth: Chapter 1 (attack paths, Go lab) and Chapter 77 (architecture review); and the whole-series request walkthrough, HTTPS Chapter 25.