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Cloudflare cheat sheet & developer notes

Cloudflare cheat sheet and 2 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Cloudflare

Workers, R2, D1 & the Edge Platform

Workers, R2, D1 & the Edge Platform. Workers — Edge Compute. export default { async fetch(request, env) { const url = new URL(request.url); if (url.pathname === '/api/hello') { return new Response('Hello from the edge!',…

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02 · Cloudflare

DNS, CDN & SSL Modes

DNS, CDN & SSL Modes. What Cloudflare Is. A global edge network providing CDN, DNS, DDoS protection, and increasingly a full application platform (Workers, R2, D1, KV). Traffic routes through Cloudflare's edge before rea…

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Concepts to know for Cloudflare

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Core Web VitalsWhat LCP, INP and CLS actually measure in the browser, the fixes that move each one, and why a green Lighthouse score can go with red field data.Intermediate·14 minHTTP CachingHow browsers and CDNs decide to reuse a response: freshness with Cache-Control, validation with ETag, cache keys with Vary, and the recipes that actually work.Intermediate·13 minImage Optimization: Formats, srcset and PriorityPick the format, let srcset and sizes choose the pixels for each screen, and load the hero first without layout shift: the three decisions behind fast images.Intermediate·13 minDNS Resolution: From Name to IP AddressHow a resolver walks root, TLD and authoritative servers to turn a name into an address, why TTL caching explains "propagation", and where DNS breaks.Intermediate·13 minHTTP/2 and HTTP/3: Multiplexing, QUIC and HOL BlockingWhat HTTP/2 multiplexing fixed in HTTP/1.1, why one lost TCP packet still stalls every stream, and how HTTP/3 over QUIC moves the fix into UDP.Intermediate·13 minThe TLS Handshake and Certificate ChainsWhat happens in the round trip before HTTPS sends a byte: key exchange, certificate checks, forward secrecy, 0-RTT, and why handshakes fail in production.Intermediate·14 min

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