04 — HTTP Module (No Framework)

Core Concepts

• http.createServer — create a basic HTTP server
• IncomingMessage (req) — the request object (method, url, headers, body stream)
• ServerResponse (res) — the response object (statusCode, setHeader, write, end)
• Routing — manual URL + method matching
• Body parsing — collecting request body from stream
• Static files — serving files from disk
• HTTPS — https.createServer with TLS certificates

This topic shows how HTTP works under the hood — the foundation Express builds on.