Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>The getResponseHeader() function is used to return specific header information from a resource, like length, server-type, content-type, last-modified, etc.</p>
<p>Last modified: <span id="demo"></span></p>

<button onclick="loadDoc('ajax_info.txt')">Get "Last-Modified" information</button>

<script>
function loadDoc(url) {
  var xhttp=new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
      document.getElementById("demo").innerHTML = xhttp.getResponseHeader('Last-Modified');
    }
  };
  xhttp.open("GET", url, true);
  xhttp.send();
}
</script>

</body>
</html>