CDN Origin Shielding in 2026: Multi-Tier Cache, Cache Hit Ratio, and TTFB
How CDN origin shielding raises cache hit ratio and cuts origin TTFB. Setup for Fastly, Cloudflare, and CloudFront with Cache-Control tips and debug headers.
Articles by Mateo Silva
CDN Cache Tags in 2026: Surrogate Keys, Purge-by-Tag, and Instant Invalidation
How CDN cache tags and surrogate keys work in 2026: headers, purge APIs, and stale-while-revalidate pairing on Fastly, Cloudflare, Vercel, Netlify, and Akamai.
No-Vary-Search Header: Reuse Prefetch and Disk Cache Across Query Params (2026)
Learn how the No-Vary-Search response header lets Chrome 141 reuse prefetches and disk cache entries across utm_ and other query parameters, with copy-paste recipes and debugging tips.
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.
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.