code: func (m *kubeGenericRuntimeManager) GetAttach(id kubecontainer.ContainerID, stdin, stdout, stderr, tty bool) (*url.URL, error) {
  	req := &runtimeapi.AttachRequest{
  		ContainerId: id.ID,
  		Stdin:       stdin,
  		Stdout:      stdout,
  		Stderr:      stderr,
  		Tty:         tty,
  	}
  	resp, err := m.runtimeService.Attach(req)
  	if err != nil {
  		return nil, err
  	}
  	return url.Parse(resp.Url)
  }
docs: // GetAttach gets the endpoint the runtime will serve the attach request from.