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Phase 2: HTTP in depth (methods, status, headers, REST, idempotency), HTTP/1.1 vs HTTP/2, a raw Node server, request parsing, a hand-rolled router, streaming and SSE, cookies, CORS, caching/ETag, compression, and graceful shutdown.
Phase 3: master Express 5 — the request lifecycle, the middleware pipeline, routing and routers, a layered architecture, a typed error strategy with async handling, Zod validation, the production security stack, and graceful shutdown.
Add behavior without touching the original: the Decorator pattern via higher-order functions, wrapping a service to add caching/logging/retry, the middleware chain, and how TS decorators (and the new standard) compare.