<!DOCTYPE html>
<html>
<body>
<h2>The XMLHttpRequest Object</h2>
<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>
<script>
const xhttp=new XMLHttpRequest();
xhttp.onload = function() {
document.getElementById("demo").innerHTML =
this.getResponseHeader("Last-Modified");
}
xhttp.open("GET.html", "ajax_info.txt");
xhttp.send();
</script>
</body>
</html>