| <!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> |