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<html>
<head>
<script type="text/javascript">
var xmlhttp

function loadXMLDoc(url)
{
xmlhttp=null
// code for Mozilla, etc.
if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest()
  }
// code for IE
else if (window.ActiveXObject)
  {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
  }
if (xmlhttp!=null)
  {
  xmlhttp.onreadystatechange=state_Change
  xmlhttp.open("GET",url,true)
  xmlhttp.send(null)
  }
else
  {
  alert("Your browser does not support XMLHTTP.")
  }
}

function state_Change()
{
// if xmlhttp shows "loaded"
if (xmlhttp.readyState==4)
  {
  // if "OK"
  if (xmlhttp.status==200)
  {
  document.getElementById('T1').innerHTML=xmlhttp.getAllResponseHeaders()
  }
  else
  {
  alert("Problem retrieving data:" + xmlhttp.statusText)
  }
  }
}

</script>
</head>

<body onload="loadXMLDoc('/example/xmle/xmle_test_xmlhttp.txt')">
<p>
With a HEAD request, a server will return the headers of a resource (not the resource itself). This means you can find out the Content-Type or Last-Modified of a document, without downloading it itself.
</p>
<pre id="T1" style="border:1px solid red;height:180;width:550"></pre>
</body>

</html>

W3School TIY Editor