addTorrentUrl(data, callback) {
      this.addTorrent('api/torrents/add-urls', data, callback);
    }
isBasePath
@see https://github.com/Flood-UI/flood/blob/master/server/models/ClientRequest.js#L143-L149
@see https://rtorrent-docs.readthedocs.io/en/latest/cmd-ref.html