Aggregate requests

This code sends two GET requests to two URLs and aggregates the responses into one.

addEventListener("fetch", (event) => {
    event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  // someHost is set up to return JSON responses
  const someHost = "https://jsonplaceholder.typicode.com";
  const url1 = someHost + "/todos/1";
  const url2 = someHost + "/todos/2";

  const responses = await Promise.all([fetch(url1), fetch(url2)]);
  const results = await Promise.all(responses.map((r) => r.json()));

  const options = {
    headers: { "content-type": "application/json;charset=UTF-8" },
  };
  return new Response(JSON.stringify(results), options);
}