1. The Passenger -

If you are developing for the app server, features typically involve optimizing deployment for Ruby, Node.js, or Python applications.

Developing distinct line features for commuter (high frequency), intercity (balanced), and cross-country (high capacity) passenger service. 1. The Passenger

A feature for Ruby apps that runs the garbage collector between requests to improve performance. If you are developing for the app server,

The ability to serve multiple applications simultaneously from one instance. 1. The Passenger