public static function download($data){
        if (is_array($data)) {
            if (isset($data['filename'])) static::$force_dl = $data['filename'];
            if (isset($data['charset'])) static::charset($data['charset']);
            if (isset($data['mime'])) static::type($data['mime']);
            if (isset($data['body'])) static::body($data['body']);
        } else static::$force_dl = $data;
    }