Concept map

A hierarchy for teaching: the big idea broken into what you must understand first.

For Teachers, technical educators

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Illustrative concept map rooted at HTTP caching. Prerequisites: request, response. Then cache key and freshness. Cache key → vary header; freshness → cache-control and expiry; expiry → revalidation; revalidation → 304 response and CDN behaviour. A 304 is a result of revalidation, not a sibling of it. Keep these exact concepts and dependencies.

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Charts and diagrams use this style. Image-model artwork keeps its curated example.

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