Most likely, you're going to be using a web framework to get your Ruby application on the internet. In this section, we are going to talk about a framework called Sinatra (http://www.sinatrarb.com/). This will be an introduction to the framework with the goal of giving you an idea of what this framework is all about and how you can use it to get your Ruby programs on the web.
Sinatra is a framework that is built in Ruby, so it is flexible, fast, and lightweight. Most importantly, it lets you run Ruby code on the web without the need for a lot of Sinatra-specific code.
Let's dive in by creating a couple of files called app.rb and config.ru.
Open the config.ru file and add this code:
require './app'
This code allows config.ru to pull in the code from the app.rb file.
Let's insert another line of code:
run HiSinatra
For this...