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<!DOCTYPE html>
<html>
<head>
<title>XMLHttpRequest: setRequestHeader() - empty header</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="/following::ol/li[4]/p[contains(@class,'note')] /following::ol/li[6]" />
</head>
<body>
<div id="log"></div>
<script>
function request(value) {
test(function() {
var client = new XMLHttpRequest()
client.open("POST", "resources/inspect-headers.py?filter_name=X-Empty", false)
client.setRequestHeader('X-Empty', value)
client.send(null)
assert_equals(client.responseText, 'x-empty: '+ String(value).toLowerCase()+'\n' )
}, document.title + " (" + value + ")")
}
request("")
request(null)
request(undefined)
</script>
</body>
</html>
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