We heavily cache, as the article suggests, and to cache bust things we simply add ?nn,n to the url. e.g. site.js?1234 Whenever we update something, whether an

We heavily cache, as the article suggests, and to cache bust things we simply add ?nn,n to the url. e.g. site.js?1234 Whenever we update something, whether an image, js, or css, we increment the number. Most of it is automated since we have millions of images.