googlitch_webgl_body_proxy.rb

#!/usr/bin/env ruby

require 'webrick'
require 'webrick/httpproxy'

handler = Proc.new() do |req,res|
  if (req.host == 'bodybrowser.googlelabs.com') && req.path =~ %r{/r3/assets/textures/}
    res.body.gsub!(/0/m, rand(10).to_s)
    res['cache-control'] = 'no-cache'
  end
end

s = WEBrick::HTTPProxyServer.new(
  :BindAddress => '0.0.0.0',
  :Port => 8080,
  :ProxyContentHandler => handler
  )

Signal.trap('INT') do
  s.shutdown
end

s.start