1 files changed, 26 insertions, 0 deletions
diff --git a/testing/web-platform/tests/xhr/header-user-agent-async.htm b/testing/web-platform/tests/xhr/header-user-agent-async.htm
new file mode 100644
index 0000000000..8c1d0b663f
--- /dev/null
+++ b/testing/web-platform/tests/xhr/header-user-agent-async.htm
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Test that async requests (both OPTIONS preflight and regular) are sent with the User-Agent header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+<script type="text/javascript">
+  async_test((test) => {
+    let xhr = new XMLHttpRequest;
+    xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/header-user-agent.py");
+    xhr.setRequestHeader("x-test", "foobar");
+
+    xhr.onerror = test.unreached_func("Unexpected error");
+
+    xhr.onload = test.step_func_done(() => {
+      assert_equals(xhr.responseText, "PASS");
+    });
+
+    xhr.send();
+  }, "Async request has User-Agent header");
+</script>
+</body>
+</html>