maintenance mode

<Location />
        RewriteEngine On
        RewriteCond %{REQUEST_FILENAME} !-f
        RewriteRule ^(.*)$ /app.php [QSA,L]

        ####################################################
        ########### MAINTENANCE FILE HANDLE ################
        ErrorDocument 503 /maintenance.html
        
        ### add here the granted ips ###
        RewriteCond %{REMOTE_ADDR} !^85.68.186.177$
        RewriteCond %{REMOTE_ADDR} !^90.59.143.188$
        RewriteCond %{REMOTE_ADDR} !^81.50.112.141$

        RewriteCond %{REQUEST_URI} !\.(css|gif|jpg|png)$
        RewriteCond %{DOCUMENT_ROOT}/maintenance.html -f
        RewriteCond %{SCRIPT_FILENAME} !maintenance.html
        RewriteRule ^.*$  -  [redirect=503,last]
        ####################################################

</Location>