How to run a simple ruby script in any web server (Apache or Mongrel or any thing else)

Question

It seems very funny to me that when I search something related ruby, all ruby on rails related results popped up. So nobody using raw ruby anymore?

However, I am new to

Answer 1

#!/usr/bin/env ruby  //shebang line to indicate path to ruby.
require 'cgi'       //cgi file to create a simple cgi object.
cgi = CGI.new      //instantiating a cgi object. 
puts cgi.header   //thats telling the server about the type(html).
puts "hello"      // thats the output on the browser.