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<html><body><h1>The XMLHttpRequest Object</h1><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>var xhttp=new XMLHttpRequest();xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("demo").innerHTML = this.getResponseHeader("Last-Modified"); }};xhttp.open("GET", "ajax_info.txt", true);xhttp.send();</script></body></html>