Simple rack app

gistfile1.rb

run proc{
  res = "Hello World"
  [
    200, 
    {
      "Connection" => "close", 
      "Access-Control-Allow-Origin" => [ "http://domain1.com", "http://domain2.com" ] * "\n", 
      "Content-Length" => res.bytesize.to_s
    }, 
    [res] 
  ]
}