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.
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.