Tiny static-site Rack server

config.ru

require 'rubygems'
require 'bundler/setup'

require 'rack'

@root = File.expand_path(File.dirname(__FILE__))
 
run Proc.new { |env|
  path  = Rack::Utils.unescape(env['PATH_INFO'])
  index = "#{@root}#{path}/index.html"
 
  if File.exists?(index)
    [200, {'Content-Type' => 'text/html'}, [File.read(index)]]
  else
    Rack::Directory.new(@root).call(env)
  end
}

Gemfile

source :rubygems

gem 'rack'