async function handleRequest(request) {
  // リモートリソースを取得します。
  const response = await fetch('https://static.cloudcachetci.com/qcloud/main/scripts/release/common/vendors/jquery-3.2.1.min.js');
  return response;
}

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