WEBrick command line server

webrick.rb

#!/usr/bin/ruby

require 'webrick'
require 'optparse'

options = { :port => 4000, :host => 'localhost', :root => '.' }
OptionParser.new do |opts|
  opts.banner = "Usage: webrick.rb [options]"

  opts.on("-p", "--port [port]", "Set the port to use, defaults to 4000.") do |p|
    options[:port] = r
  end

  opts.on("-r", "--root [root path]", "Set the webroot path. Defaults to the current path.") do |r|
    options[:root] = r
  end
end.parse!

class NonCachingFileHandler < WEBrick::HTTPServlet::FileHandler
  def do_GET(req, res)
    super

    res['ETag']          = nil
    res['Last-Modified'] = Time.now + 100**4
    res['Cache-Control'] = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0'
    res['Pragma']        = 'no-cache'
    res['Expires']       = Time.now - 100**4
  end
end

puts "Web Server Starting at http://"+options[:host]+":"+options[:port].to_s+" ...\n"
server = WEBrick::HTTPServer.new :Port => options[:port], :Host => options[:host]
server.mount "/", NonCachingFileHandler, options[:root]
trap('INT') { server.stop }
server.start