wpt: add redirect-back-to-original-origin.any.js

Author: KhafraDev

test/wpt/server/server.mjs

@@ -32,6 +32,7 @@ const server = createServer(async (req, res) => {
   const fullUrl = new URL(req.url, `http://localhost:${server.address().port}`)
 
   switch (fullUrl.pathname) {
+    case '/fetch/api/resources/cors-top.txt':
     case '/fetch/api/resources/top.txt':
     case '/mimesniff/mime-types/resources/generated-mime-types.json':
     case '/mimesniff/mime-types/resources/mime-types.json':

test/wpt/tests/fetch/api/redirect/redirect-back-to-original-origin.any.js

@@ -0,0 +1,38 @@
+// 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();

test/wpt/tests/fetch/api/resources/cors-top.txt

@@ -0,0 +1 @@
+top