RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !^/maintenance.php$
RewriteRule ^(.*)$ /maintenance.php [R=307,L]

<Directory />
    AllowOverride none
    Require all denied
</Directory>

<Directory />
    AllowOverride All
    Require all granted
</Directory>

DocumentRoot "/var/www/html"

DocumentRoot "/var/www"

<Directory "/var/www">
    #AllowOverride None
    AllowOverride All
    # Allow open access:
    Require all granted
</Directory>