Cache-Status Header: Debug CDN Hits and Misses (RFC 9211)
Learn how RFC 9211's Cache-Status header exposes hits, misses, forwards, and coalesced requests across your CDN chain. Includes vendor mapping and TTFB attribution patterns.
HTTP Caching Articles
Stale-While-Revalidate Cache-Control: Hide Origin Latency Without Serving Bad Data
How to use the stale-while-revalidate Cache-Control directive to serve cached responses instantly while revalidating in the background. RFC 5861 recipes, CDN support in 2026, and footguns to avoid.