1 files changed, 9 insertions, 3 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
index 837e216a01..99d5456a87 100644
--- a/testing/web-platform/tests/fetch/security/dangling-markup/service-worker.js
+++ b/testing/web-platform/tests/fetch/security/dangling-markup/service-worker.js
@@ -16,18 +16,24 @@ addEventListener('fetch', evt => {
   const url = new URL(evt.request.url);
   const path = url.pathname;
   const search = url.search || "?";
+  const params = new URLSearchParams(search);
+  const type = params.get('type');
   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(""));
+    evt.respondWith(new Response("", {
+      headers: {
+        "Content-Type": type || "text/plain"
+      }
+    }));
   } else if (path.endsWith('resources.html')) {
-    const html = (new URLSearchParams(search)).get('html');
+    const html = params.get('html') || "";
     evt.respondWith(new Response(html, {
       headers: {
-        "Content-Type": "text/html"
+        "Content-Type": type || "text/html"
       }
     }));
   }