HTTP 200 OK
Content-type: text/html


<script>
	var xhr = new XMLHttpRequest();
	if (!xhr) {
		alert("sucky browser you got");
		throw("sucky browser, breaking script");
	}
	xhr.open("GET", "123", true);
	setTimeout(
		function() {
			xhr.send();
			setInterval(
				function() {
					document.write(xhr.responseText);
				}, 500);
		}, 2000);
	
</script>