CDN Caching

Learn how CDN caching works, which assets and responses are safe to cache, how cache keys and purges work, and how to avoid serving private data publicly.

A practical Cache-Control guide with safe patterns for static assets, HTML, APIs, private data, shared CDNs, revalidation, and stale responses.

Learn how to distinguish a real cache miss from a bypass or revalidation, find the root cause, and improve CDN cache efficiency without caching private data.

Learn how cache warming reduces cold-cache latency, which URLs to warm, how to avoid stale or unsafe content, and what to measure at the edge.

Learn how to invalidate CDN content safely with scoped purges, versioned assets, stale serving, verification, and rollback procedures.

Learn what to cache at the edge, how to handle dynamic and personalized content, and how to verify cache correctness without leaking data.

Redirect chains, cached responses, and inconsistent canonical signals can slow users and complicate crawling. Learn how to design and measure them safely.

A practical guide to Next.js caching on Vercel: cache Acme Shop public catalog and database reads safely with cache boundaries and safe cache defaults, while keeping personalized responses out of shared caches.

A Next.js 16 guide to Next.js revalidation on Vercel: drive on-demand ISR from one trusted Acme Shop publishing event, tag public data correctly, apply stale-while-revalidate safely, and recover without broad purges.

A production-safe Next.js cache debugging workflow to classify Acme Shop cache behavior, read Vercel cache headers and cache HIT MISS states, and recover with the narrowest Vercel action.

Configure and validate Cloudflare Cache Rules safely, with clear cache-key, origin-header, and purge responsibilities for public web content.

Configure and validate Fastly VCL caching with explicit TTLs, a disciplined VCL cache key and TTL contract, correct Fastly pass behavior, origin-failure handling, shielding, staged activation, and practical rollback steps.

Configure Fastly origin shielding safely by choosing a shield near each origin, assigning it per backend, verifying cache-miss behavior, monitoring logs and headers, and retaining a rollback path.