async initRootType() {
    const root_id = this.root["id"];
    const types = CONSTS.gd_root_type;
    if (root_id === "root" || root_id === authConfig.user_drive_real_root_id) {
      this.root_type = types.user_drive;
    } else {
      const obj = await this.getShareDriveObjById(root_id);
      this.root_type = obj ? types.share_drive : types.sub_folder;
    }
  }
Returns a response that requires authorization, or null
@param request
@returns {Response|null}