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.