class ActionController::Live::Buffer

def write(string)
  unless @response.committed?
    @response.headers["Cache-Control"] ||= "no-cache"
    @response.delete_header "Content-Length"
  end
  super
  unless connected?
    @buf.clear
    unless @ignore_disconnect
      # Raise ClientDisconnected, which is a RuntimeError (not an
      # IOError), because that's more appropriate for something beyond
      # the developer's control.
      raise ClientDisconnected, "client disconnected"
    end
  end
end