This sounds like a good use case for Promise.all() and fetch:

  const first = fetch(endpoint1);
  const rest = Promise.all([
    fetch(e2), fetch(e3), fetch(e4),
  ]);
  // cancel here
  const json1 = await first.json();
  const json234 = await rest.json();

While native promises can't cancel on their own, with a library like Bluebird you can get that functionality.