redirect-back-to-original-origin.any.js

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This WPT test may be referenced by the following Test IDs:
- /fetch/api/redirect/redirect-back-to-original-origin.any.html - WPT Dashboard Interop Dashboard
- /fetch/api/redirect/redirect-back-to-original-origin.any.serviceworker.html - WPT Dashboard Interop Dashboard
- /fetch/api/redirect/redirect-back-to-original-origin.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /fetch/api/redirect/redirect-back-to-original-origin.any.worker.html - WPT Dashboard Interop Dashboard

// META: global=window,worker

// META: script=/common/get-host-info.sub.js

const BASE = location.href;

const IS_HTTPS = new URL(BASE).protocol === 'https:';

const REMOTE_HOST = get_host_info()['REMOTE_HOST'];

const REMOTE_PORT =

  IS_HTTPS ? get_host_info()['HTTPS_PORT'] : get_host_info()['HTTP_PORT'];

const REMOTE_ORIGIN =

  new URL(`//${REMOTE_HOST}:${REMOTE_PORT}`, BASE).origin;

const DESTINATION = new URL('../resources/cors-top.txt', BASE);

function CreateURL(url, BASE, params) {

  const u = new URL(url, BASE);

  for (const {name, value} of params) {

    u.searchParams.append(name, value);

  return u;

const redirect =

  CreateURL('/fetch/api/resources/redirect.py', REMOTE_ORIGIN,

            [{name: 'redirect_status', value: 303},

             {name: 'location', value: DESTINATION.href}]);

promise_test(async (test) => {

  const res = await fetch(redirect.href, {mode: 'no-cors'});

  // This is discussed at https://github.com/whatwg/fetch/issues/737.

  assert_equals(res.type, 'opaque');

}, 'original => remote => original with mode: "no-cors"');

promise_test(async (test) => {

  const res = await fetch(redirect.href, {mode: 'cors'});

  assert_equals(res.type, 'cors');

}, 'original => remote => original with mode: "cors"');

done();