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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>Test that sync CORS requests with custom headers are not 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>
</head>
<body>
<script type="text/javascript">
test(function() {
let xhr = new XMLHttpRequest;
const uuid = token();
xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
"/xhr/resources/reset-token.py?token=" + uuid, false);
xhr.send();
xhr = new XMLHttpRequest;
xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
"/xhr/resources/no-custom-header-on-preflight.py?token=" + uuid, false);
xhr.setRequestHeader("x-test", "foobar");
xhr.send();
assert_equals(xhr.responseText, "PASS");
}, "Preflighted sync request with custom header");
</script>
</body>
</html>