AJAX Response

<!DOCTYPE html>
<html>
<body>

<h2>The XMLHttpRequest Object</h2>
<p>The getAllResponseHeaders() function returns all the header information of a resource, like length, server-type, content-type, last-modified, etc:</p>

<p id="demo"></p>

<script>
const xhttp = new XMLHttpRequest();
xhttp.onload = function() {
  document.getElementById("demo").innerHTML =
  this.getAllResponseHeaders();
}
xhttp.open("GET", "/files/ajax.txt");
xhttp.send();
</script>

</body>
</html>

The XMLHttpRequest Object

The getAllResponseHeaders() function returns all the header information of a resource, like length, server-type, content-type, last-modified, etc: