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Test Info:

<!DOCTYPE html>
<title>Tests async XHR preflight denial due to lack of CORS headers</title>
<!--The original test addressed a more specific issue involving caching,
but that issue has since been resolved.
We maintain this test as a basic test of invalid preflight denial.
Please refer to the comment in the following link for more information:
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script type="text/javascript">
async_test((test) => {
const xhr = new XMLHttpRequest;
xhr.onerror = test.step_func_done(() => {
assert_equals(xhr.status, 0);
xhr.onload = test.unreached_func("Request succeeded unexpectedly");"FOO", get_host_info().HTTP_REMOTE_ORIGIN +