A fresh guide reframes HTTP caching as less of a tweak, more of an architectural move. It breaks caching into layers - browser memory, CDNs, reverse proxies, app stores - and shows how each one plays a part (or gets in the way).
It gets granular with headers like Cache-Control, ETag, and Vary, calling out common faceplants like no-store abuse or using Vary: Cookie like it's harmless. Hint: itβs not. When cache layers slip out of sync, stale content isn't just annoying - it can quietly break critical flows.
