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Test Info:

<!DOCTYPE html>
<title>Tests that preflight requests returning invalid 400 status code result in error.</title>
<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;"GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/");
xhr.setRequestHeader("x-pass", "pass");
xhr.onerror = test.step_func_done(function() {
assert_equals(xhr.status, 0);
xhr.onload = test.unreached_func("Invalid 400 response to preflight should result in error.");
}, "Request with 400 preflight response");