<!doctype html>
<script>
var worker = new SharedWorker('./claim-shared-worker-fetch-worker.js');

function fetch_in_shared_worker(url) {
  return new Promise((resolve) => {
    worker.port.onmessage = (event) => {
      resolve(event.data);
    };
    worker.port.postMessage(url);
  });
}
</script>