How does web caching work?
Web caching reuses a previous HTTP response when its rules allow it.
Freshness and validation
Cache-Control defines storage and freshness. After expiry, a conditional request with an ETag may return 304 if unchanged, avoiding a new body transfer.
Uses and limitations
It speeds page loads and saves bandwidth. Caching personalized responses in a shared cache can leak data; private and no-store directives must be chosen correctly.
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