Multiple popular Ruby web servers exist. Each Ruby application is different and the ultimate tl;dr for configuring a web server is: it depends. This post will not prescribe one web server or configuration over another and will instead explain internal components most popular servers contain.

In order to facilitate more than one request at a time, a Ruby web server implements Threads, Processes, or both. These tools are used to enable concurrency and are beneficial in different ways. Understanding these tools is the best way to configure your web server correctly