CDN-Cache-Control: Precision Control for your CDN(s)

On May 21, 2021, a new set of HTTP response headers called "CDN-Cache-Control" was announced. This feature allows customers to control how Cloudflare's CDN behaves without affecting other caches. The CDN-Cache-Control is similar to the Cache-Control header but provides more specific directives for managing CDN cache behavior. It helps solve problems caused by non-specific directives in Cache-Control, which can lead to unexpected behavior and confusion as the number of intermediary caches grows between an origin and the client. The new headers provide CDN-specific control for when to use stale assets to fulfill requests. Overall, CDN-Cache-Control allows finer grained control of how Cloudflare manages cache lifetimes and revalidation behavior on a per-asset basis.

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