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HTTP Cache Headers Basics

Control caching with headers

Setting proper HTTP caching uses Cache-Control directives, validators like ETag/Last-Modified, and separation of static vs dynamic resources to balance speed and correctness.

Set Cache-Control

Use max-age, immutable where safe; no-store for sensitive data.

Validate

Provide ETag/Last-Modified; support conditional requests.

Scope

Cache static assets longer; keep dynamic responses short.

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