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The XMLHttpRequest Object

The getResponseHeader() function is used to return specific header information from a resource, like length, server-type, content-type, last-modified, etc:

Last modified:

const xhttp=new XMLHttpRequest();
xhttp.onload = function() {

// display the "last modified header of the XMLHttpRequest Object
  document.getElementById("demo").innerHTML =
  this.getResponseHeader("Last-Modified");
}

// defines the XMLHttpRequest Object
xhttp.open("GET", "ajax_info.txt");
xhttp.send();