Vercel’s CDN, which can proxy requests to external backends, now caches proxied responses using the and headers. This aligns caching behavior for external backends with how Vercel Functions are already cached.CDN-Cache-ControlVercel-CDN-Cache-Control This is available starting today, on all plans, at no additional cost. Per the Targeted HTTP Cache Control spec (), these headers support standard directives like and , enabling fine-grained control over CDN caching without affecting browser caches.RFC 9213max-agestale-while-revalidate You can return the headers directly from your backend, or define them in under the key if your backend can't be modified.vercel.jsonheaders No configuration changes or redeployments required.

Return the header (or set it in ) to improve performance, reduce origin load, and ensure fresh content.vercel.json Learn more about .CDN-Cache-Control headers Read more