gistfile1.rb

require 'rubygems'
require 'rack'
require 'rack-legacy'
require 'rack-rewrite'
require 'rack/tidy'

# flipped, returning late rather than first to get around LocalJumpError
# http://blog.jayfields.com/2007/03/ruby-localjumperror-workaround.html#4379157363252949431
INDEXES = ['index.cgi', 'index.php', 'index.html']

use Rack::Rewrite do
  rewrite %r{(.*/$)}, lambda {|match, rack_env|
    served_file = rack_env['PATH_INFO']
    INDEXES.each do |index|
      if File.exists?(File.join(Dir.getwd, rack_env['PATH_INFO'], index))
        served_file =  rack_env['PATH_INFO'] + index
      end
    end
    served_file
  }
end

use Rack::Tidy

use Rack::Legacy::Php, Dir.getwd
use Rack::Legacy::Cgi, Dir.getwd
run Rack::File.new Dir.getwd