mozilla-release/testing/web-platform/tests/cors/status-preflight.htm

<!DOCTYPE html>
<meta charset=utf-8>
<title>CORS - status after preflight</title>
<meta name=author title="Odin Hørthe Omdal" href="mailto:odiho@opera.com">

<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=support.js?pipe=sub></script>

<h1>Status after preflight</h1>

<div id=log></div>
<script>
var counter = 0

function statusAfterPreflight(method, code) {
    counter++

    async_test(document.title + " on " + method + " " + code).step(function() {
        var client = new XMLHttpRequest()
        client.open(method, CROSSDOMAIN + "resources/status.py?" + counter
            +"&code=" + code + '&headers=x-nonsimple&preflight=200', true)

        client.setRequestHeader('x-nonsimple', true)
        client.onreadystatechange = this.step_func(function() {
            if (client.readyState < client.HEADERS_RECEIVED)
                return
            assert_equals(client.response, "", "response data")
            assert_equals(client.status, code, "response status")
            if (client.readyState == client.DONE) {
                /* Wait for spurious error events */
                this.step_timeout(() => { this.done() }, 10)
            }
        })

        client.onerror = this.step_func(function() {
            assert_unreached("Shouldn't throw no error event!")
        })

        client.send()
    })
}

/*                   method     code */
statusAfterPreflight("GET",     200)
statusAfterPreflight("GET",     204)
statusAfterPreflight("GET",     400)
statusAfterPreflight("GET",     401)

statusAfterPreflight("HEAD",    200)
statusAfterPreflight("HEAD",    204)
statusAfterPreflight("HEAD",    400)
statusAfterPreflight("HEAD",    401)
statusAfterPreflight("HEAD",    501)
statusAfterPreflight("HEAD",    699)

statusAfterPreflight("POST",    204)
statusAfterPreflight("POST",    400)
statusAfterPreflight("POST",    401)
statusAfterPreflight("POST",    404)

statusAfterPreflight("PUT",     699)
statusAfterPreflight("CHICKEN", 501)

</script>