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<!DOCTYPE html> <html> <body> <p>The getAllResponseHeaders() function returns the header information of a resource, like length, server-type, content-type, last-modified, etc.</p> <button onclick="loadDoc()">Get header information</button> <p id="demo"></p> <script> function loadDoc() { var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (xhttp.readyState == 4 && xhttp.status == 200) { document.getElementById("demo").innerHTML = xhttp.getAllResponseHeaders(); } }; xhttp.open("GET", "ajax_info.txt", true); xhttp.send(); } </script> </body> </html>