Get headers of file from ajax request

headers.js

function returnheaders(ajaxrequest) {
    var headers = ajaxrequest.getAllResponseHeaders(); 
    var arrofheaders = headers.trim().split(/[\r\n]+/);
    var mapofheaders = {};
    arrofheaders.forEach(function (line) {
      var parts = line.split(': ');
      var header = parts.shift();
      var value = parts.join(': ');
      mapofheaders[header] = value;
    });
    return mapofheaders;
}

// Usage

$.ajax({
  src: "test.txt"
}).done(function(data, textStatus, jqXHR) {
  var headers = returnheaders(jqXHR);
  console.log(headers);
});