Edge Cache

The Web Cache API is supported on Deno Deploy. The cache is designed to provide microsecond-level read latency, multi-GB/s write throughput and unbounded storage, with the tradeoff of best-effort consistency and durability.

const cache = await caches.open("my-cache");

Deno.serve(async (req) => {
  const cached = await cache.match(req);
  if (cached) {
    return cached;
  }

  const res = new Response("cached at " + new Date().toISOString());
  await cache.put(req, res.clone());
  return res;
});

Cached data is stored in the same Deno Deploy region that runs your code. Usually your isolate observes read-after-write (RAW) and write-after-write (WAW) consistency within the same region; however, in rare cases recent writes can be lost, out-of-order or temporarily invisible.

Limitations Jump to heading#

• If a response is not constructed from a Uint8Array or string body, the Content-Length header needs to be manually set.
• Deletion is not yet supported.