Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script> function loadXMLDoc(url) { var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById('p1').innerHTML=xmlhttp.getAllResponseHeaders(); } } xmlhttp.open("GET",url,true); xmlhttp.send(); } </script> </head> <body> <p id="p1">The getAllResponseHeaders() function returns the header information of a resource, like length, server-type, content-type, last-modified, etc.</p> <button onclick="loadXMLDoc('ajax_info.txt')">Get header information</button> </body> </html>
Result:
W3Schools.com - Try it yourself