HTTP proxy example

#!/usr/bin/env ruby
require 'rubygems'
require 'net/ntlm'
require 'webrick/httpproxy'

class ProxyServer
  def pre_handler(req, res)
    # check if this request applies to a previously authenticated
    # realm and send Authorization header if so
  end
  
  def post_handler(req, res)
    # check for the presence of the www-authenticate header and retry
    # the request with the Authorization header set
  end
  
  def initialize
    @server = WEBrick::HTTPProxyServer.new(
      :Port => '9090',
      :LogFile => $stdout,
      :BindAddress => "0.0.0.0",

      :RequestCallback => method(:pre_handler),
      :ProxyContentHandler => method(:post_handler)
    )
  end
  
  def start
    @server.start
  end

  def stop
    @server.shutdown
  end
end

ps = ProxyServer.new
%w[INT HUP].each { |signal| trap(signal) { ps.stop } }
ps.start