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<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><button onclick="loadXMLDoc('xmlhttp_info.txt')">Get "Last-Modified" information</button><p id="demo"></p><script>function loadXMLDoc(url) { var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("demo").innerHTML = "Last modified: " + this.getResponseHeader('Last-Modified'); } }; xmlhttp.open("GET", url, true); xmlhttp.send();}</script></body></html>