1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/security/dangling-markup/service-worker.js b/testing/web-platform/tests/fetch/security/dangling-markup/service-worker.js
new file mode 100644
index 0000000000..837e216a01
--- /dev/null
+++ b/testing/web-platform/tests/fetch/security/dangling-markup/service-worker.js
@@ -0,0 +1,35 @@
+const requests = new Set();
+
+addEventListener('install', evt => {
+  evt.waitUntil(self.skipWaiting());
+});
+
+addEventListener('activate', evt => {
+  evt.waitUntil(self.clients.claim());
+});
+
+addEventListener('message', evt => {
+  evt.source.postMessage(requests);
+});
+
+addEventListener('fetch', evt => {
+  const url = new URL(evt.request.url);
+  const path = url.pathname;
+  const search = url.search || "?";
+  if (path.includes('404')) {
+    const dir = path.split('/');
+    const request = dir[dir.length-1] + search;
+    if (!requests.has(request)) {
+      requests.add(request);
+    }
+    evt.respondWith(new Response(""));
+  } else if (path.endsWith('resources.html')) {
+    const html = (new URLSearchParams(search)).get('html');
+    evt.respondWith(new Response(html, {
+      headers: {
+        "Content-Type": "text/html"
+      }
+    }));
+  }
+  return;
+});