Cloudflare Docs
Workers
Cloudflare Docs
Workers
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  1. Products
  2. Workers
  3. Runtime APIs
  4. Fetch

Fetch

The Fetch API provides an interface for asynchronously fetching resources via HTTP requests inside of a Worker.

​​ Syntax

export default {
  async scheduled(event, env, ctx) {
    return await fetch("https://example.com", {
      headers: {
        "X-Source": "Cloudflare-Workers",
      },
    });
  },

};

addEventListener('fetch', event => {
  // NOTE: can’t use fetch here, as we’re not in an async scope yet
  event.respondWith(eventHandler(event));

});



async function eventHandler(event) {
  // fetch can be awaited here since `event.respondWith()` waits for the Promise it receives to settle
  const resp = await fetch(event.request);
  return resp;

}

  • fetch(resource, options optional) : Promise<Response>

    • Fetch returns a promise to a Response.

​​ Parameters