Ruby Simple Local Server

rserver.rb

#!/usr/bin/env ruby
require 'webrick'
srv = WEBrick::HTTPServer.new(
  :BindAddress  => '127.0.0.1', # '0.0.0.0' allow remote access
  :Port         => (port = ARGV[0].to_i) === 0 ? 3000 : port,                              
  :DocumentRoot => './',
  :DoNotReverseLookup => true
)
trap(:INT){srv.shutdown}
srv.start