How to Double your Traffic with JavaScript

_double_your_requests.md

Making an HTTP request to undefined is the equivalent of requesting the same page again ('.' or window.location.href). The examples below were found in three out of three front-end performance audits we performed for clients at Lincoln Loop over the last two weeks.

double_your_requests.js

/*
 * Make an XHR to a variable that is undefined
 */
 
var settings = {
    urlForThis: '...',
//  urlForThat: '...'
};
$.get(settings.urlForThat);

/*
 * Variation of the same theme
 */

var url = $elem.attr('href');  // DOM element does not exist
$.getJSON(url);

/*
 * Set an image source to an undefined variable 
 */
 
 var img = new Image();
 var largeSrc = $imgObj.data('large-version'); // this data attribute does not exist
 img.src = largeSrc;