HTTP caching reduces latency, server load, and infrastructure costs by storing responses at multiple layers—browsers, CDNs, proxies, and application caches. The guide explains how Cache-Control directives (max-age, s-maxage, no-cache, no-store, stale-while-revalidate), validators (ETag, Last-Modified), and headers like Vary
Table of contents
Table of contentsThe business case for cachingMental model: who caches what?Cache keys and variantsFreshness vs validationCore HTTP caching headersFreshness & age calculationsCommon misconceptions & gotchasPatterns & recipesBeyond headers: browser behavioursCDNs in practice: CloudflareOther caching layers in the stackDebugging & verificationCaching in the AI-mediated webWrapping up: caching as strategy3 Comments
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