code: func (api *PrivateAdminAPI) StopRPC() (bool, error) {
  	api.node.lock.Lock()
  	defer api.node.lock.Unlock()
  
  	if api.node.httpHandler == nil {
  		return false, fmt.Errorf("HTTP RPC not running")
  	}
  	api.node.stopHTTP()
  	return true, nil
  }
docs: // StopRPC terminates an already running HTTP RPC API endpoint.