Sometimes we reach for a gem because it is what we know or we've had great experience with it in the past. However, sometimes the gem is a sledgehammer for a small problem. When you don't need all of the features, sometimes developing the functionality inside your application may be a better route.
A look at serving the static assets within your Ruby on Rails application with the CloudFlare CDN. A broad look at the different configuration options and setting it up to serve image, javascript, HTML, and CSS assets.