Cache Policy Is Product Behavior
Select cache-control behavior based on asset volatility, personalization, and invalidation risk.
A cache header tells the system what kind of truth a response is. Freshness saves repeat work A fresh response can be reused without contacting the origin. That is ideal for assets whose URL changes when the content changes. Hashed CSS, hashed JavaScript, versioned media, and immutable icon sets belong here. Validation protects changing content When content changes but not constantly, validators such as ETag and Last-Modified allow small conditional requests. You keep much of the speed benefit without pretending content never changes. Privacy changes the answer Personalized responses must not leak across users through shared caches. Cookies alone are…
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