Parallel Fetch

Promise.all + multiple GETs on the real network (Phase 13 pattern).

Independent requests should start together. Use Promise.all (Phase 13) with several fetch calls. One HTTP failure (after your ok check) fails the group. 

Results appear here.

Fetch three posts in parallel.

Important JavaScript

async function getPost(id) {
  const response = await fetch(BASE + id);
  if (!response.ok) {
    throw new Error("HTTP " + response.status);
  }
  return response.json();
}

const posts = await Promise.all([
  getPost(1),
  getPost(2),
  getPost(3)
]);