code: func (c *Client) SyncHandlers() ([]*SyncInfo, error) {
  	if err := c.condDiscovery(); err != nil {
  		return nil, err
  	}
  	if c.syncHandlers == nil {
  		return nil, ErrNoSync
  	}
  	return c.syncHandlers, nil
  }
docs: // SyncHandlers returns the server's sync handlers "from" and
  // "to" prefix URLs.
  // If the server isn't running any sync handler, the error
  // will be ErrNoSync.