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Test Info:

<!DOCTYPE html>
<html>
<head>
<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>
</head>
<body>
<script type="text/javascript">
async_test((test) => {
const xhr = new XMLHttpRequest;
xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-request-invalid-status.py?code=400");
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.");
xhr.send();
}, "Request with 400 preflight response");
</script>
</body>
</html>