class ActionDispatch::Response

def rack_response(status, header)
  assign_default_content_type_and_charset!(header)
  handle_conditional_get!
  header[SET_COOKIE] = header[SET_COOKIE].join("\n") if header[SET_COOKIE].respond_to?(:join)
  if NO_CONTENT_CODES.include?(@status)
    header.delete CONTENT_TYPE
    [status, header, []]
  else
    [status, header, self]
  end
end