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Why this matters: Workers used to sit in front of an origin. Now frameworks like Astro, Next.js, Remix & SvelteKit ship Cloudflare adapters where the Worker IS the origin — every request re-ran your code with nothing to cache. Workers Cache flips that.

Config is tiny. Add this to wrangler.jsonc: `{ "cache": { "enabled": true } }` Then just set Cache-Control on your Response like normal HTTP, and purge with `ctx.cache.purge({ tags: [...] })` That's the entire API surface.

`stale-while-revalidate` is what makes it feel instant. When a cache entry expires, Cloudflare serves the stale copy immediately while your Worker refreshes it in the background. No visitor ever waits on a cold render after the very first request.