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<html><body><h1>XMLHttpRequest</h1><p>The getAllResponseHeaders() function returns the header information of a resource, like length, server-type, content-type, last-modified, etc:</p><p id="demo"></p><script>var xmlhttp = new XMLHttpRequest();xmlhttp.onreadystatechange=function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("demo").innerHTML = this.getAllResponseHeaders(); }};xmlhttp.open("GET", "xmlhttp_info.txt", true);xmlhttp.send();</script></body></html>