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Test Info:

<!DOCTYPE html>
<title>Test that async CORS requests with custom headers are sent with OPTIONS preflight</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">
async_test((test) => {
let xhr = new XMLHttpRequest;
const uuid = token();"GET", get_host_info().HTTP_REMOTE_ORIGIN +
"/xhr/resources/" + uuid, false);
xhr = new XMLHttpRequest;"GET", get_host_info().HTTP_REMOTE_ORIGIN +
"/xhr/resources/" + uuid);
xhr.setRequestHeader("x-test", "foobar");
xhr.onerror = test.unreached_func("Unexpected error");
xhr.onload = test.step_func_done(() => {
assert_equals(xhr.responseText, "PASS");
}, "Preflighted async request with custom header");