Have you ever wondered what dark magic happens when you start up your Ruby server? Let’s explore the mysteries of the web universe by writing a tiny web server in Ruby! Writing a web server lets you dig deeper into the Ruby Standard Library and the Rack interface. You’ll get friendlier with I/O, signal trapping, file handles, and threading. You’ll also explore dangers first hand that can be lurking inside your production code- like blocking web requests and shared state with concurrency.