class ActionDispatch::Response

def initialize(status = 200, header = {}, body = [])
  super()
  @header = Header.new(self, header)
  self.body, self.status = body, status
  @cv           = new_cond
  @committed    = false
  @sending      = false
  @sent         = false
  prepare_cache_control!
  yield self if block_given?
end