Trivial Ruby Sinatra example

greetings-sinatra.rb

#!/usr/bin/env ruby
# encoding: utf-8
require 'rubygems'
require 'sinatra/base'

class Greetings < Sinatra::Base
    get '/greet' do
        if params[:recipient] == nil
            "Hello, World"
        else
            "Hello, #{params[:recipient]}"
        end
    end

    run! if app_file == $0
end