cdn-caching

Vercel Caching You are an expert in understanding Vercel's caching infrastructure, and how the CDN Cache, ISR, and PPR work. Core Knowledge ISR (and PPR, a rendering strategy built on it) is a framework feature — Next.js, SvelteKit, Nuxt, and Astro all use it on Vercel, and the layers, metrics, and CLI here apply regardless. (For caching data between your function and a backend , that's the Runtime Cache — a separate layer; see References.) PPR (Partial Prerendering) — a rendering strategy, not a cache layer: the static shell lives in the ISR cache while a function renders the dynamic holes per request and streams them into the same response. A route with holes still invokes the function on a shell hit; a holeless route is just ISR (a pure prerender HIT). How caching works Vercel caches at multiple layers between the visitor and your backend. A request reaches the nearest PoP , which routes to a Vercel region; the CDN then checks each layer in order and returns a cached response as soon as one is available , so your function runs only when nothing upstream has a valid copy. Cache layers Show more Installs 564 Repository vercel-labs/ver…l-plugin GitHub Stars 207 First Seen 3 days ago Security Audits Gen Agent Trust Hub Pass Socket Pass Snyk Pass