I used with Rails. Most importantly I like - I can use index.html with cache and very fast loaded in browser

* Fast robust, secure and lightweight server. * Best suited for Rails applications. * Easy to maintain and manage with Nginx. For me it's best that it has Nginx integrations. * No extra settings and maintenance required specially for Phusion Passenger. * It's free to use with Nginx, only extended feature requires pro / paid versions. * It's highly scalable * It is based on Out-of-process architecture that is really great for Rails applications. * It's also having integrations with apache. * It is having Asynchronous I/O, it helps to increase speed. * Very low bandwidth required for Phusion Passenger

The configuration is simple and scalable