Disable directory browsing in Apache
sudo vi /etc/apache2/apache2.conf
다음과 같은 내용을 확인하라.
<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
<Directory /var/www/>
Options FollowSymLinks
AllowOverride None
Require all granted
</Directory>