Test for opaque redirect handling

service-workers/redirects/opaque-redirect.window.js

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+// META: script=../service-worker/resources/test-helpers.sub.js
+
+promise_test(async t => {
+  const reg = await service_worker_unregister_and_register(t, "resources/opaque-redirect-serviceworker.js", "resources/");
+  t.add_cleanup(async () => await reg.unregister());
+  await wait_for_state(t, reg.installing, 'activated');
+  const frame = await with_iframe("resources/opaque-redirect.py");
+  assert_equals(frame.contentDocument.body.textContent, "stage 1 completed\n");
+  frame.remove();
+  const frame2 = await with_iframe("resources/x/");
+  assert_equals(frame2.contentDocument.body.textContent, "YAY!\n");
+  frame2.remove();
+}, "Passing an (opaque) redirect with a relative URL in its Location header to a second navigation with a different base URL");

service-workers/redirects/resources/opaque-redirect-result.txt

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+YAY!

service-workers/redirects/resources/opaque-redirect-serviceworker.js

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+let evilGlobalState = null;
+onfetch = e => {
+  if(e.request.url.endsWith("resources/opaque-redirect.py")) {
+    e.respondWith(new Promise(async resolve => {
+      evilGlobalState = await fetch(e.request);
+      resolve(new Response("stage 1 completed\n"));
+    }));
+  } else if(e.request.url.endsWith("resources/x/")) {
+    e.respondWith(evilGlobalState);
+  }
+}

service-workers/redirects/resources/opaque-redirect.py

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+def main(request, response):
+    response.status = 302
+    response.headers.set("Location", "opaque-redirect-result.txt")

service-workers/redirects/resources/x/opaque-redirect-result.txt

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+NOOO :-(