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Test Info:

<!DOCTYPE html>
<title>Async request denied at preflight because of non-CORS-safelisted header</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="/common/utils.js"></script>
<script type="text/javascript">
const uuid = token();
const url = get_host_info().HTTP_REMOTE_ORIGIN +
"/xhr/resources/" + uuid;
async_test((test) => {
let xhr = new XMLHttpRequest;"GET", url + "&command=reset", false);
xhr = new XMLHttpRequest;"GET", url + "&command=header", true);
xhr.setRequestHeader("x-test", "foo");
xhr.onload = test.unreached_func(
"Cross-domain access with custom header allowed without throwing exception");
xhr.onerror = test.step_func_done(() => {
xhr = new XMLHttpRequest;"GET", url + "&command=complete", false);
assert_equals(xhr.responseText, "Request successfully blocked.");
}, "Async request denied at preflight");