class WebSocket::Driver

def self.rack(socket, options = {})
  env = socket.env
  if env['HTTP_SEC_WEBSOCKET_VERSION']
    Hybi.new(socket, options.merge(:require_masking => true))
  elsif env['HTTP_SEC_WEBSOCKET_KEY1']
    Draft76.new(socket, options)
  else
    Draft75.new(socket, options)
  end
end