Simplest Rack Application Example

rack-simple.rb

#!/usr/bin/env ruby

require "rubygems"
require "rack"
require "rack/showexceptions"
require "rack/request"
require "rack/response"


class Hash
  def htmlize
    res = "{<br>"
    self.each do |key,value|
      res.concat " #{key} => #{value}<br>"
    end
    res.concat "}"
    res
  end
end

class Hello
  def call(env)
    req = Rack::Request.new(env)
    [ 
      200,
      {"Content-Type" => "text/html"},
      req.inspect
    ]
  end
end

Rack::Handler::Mongrel.run Hello.new, :Port => 3000 if __FILE__ == $0

rack-simple.ru

require "rack-simple"
use Rack::ShowExceptions
run Hello.new