map $FRONTEND_PORT $host_with_port {
    ""      $host;
    default "$host:$FRONTEND_PORT";
}

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    client_max_body_size ${NGINX_CLIENT_MAX_BODY_SIZE};

    disable_symlinks if_not_owner from=/usr/share/nginx/html;

    index index.html;
    root /usr/share/nginx/html;

    ${GZIP_BLOCK}
    ${REAL_IP_BLOCK}

    location / {
        location / {
            try_files $uri @fallback;
        }
        location ~ \.php$ {
            return 404;
        }
        location ~ /\. {
            return 404;
        }
        location ~ /\.(ht|svn|git) {
            return 404;
        }
    }

    location @fallback {
        fastcgi_pass ${BACKEND_HOST}:${BACKEND_PORT};
        fastcgi_index index.php;
        fastcgi_param REDIRECT_STATUS 200;
        fastcgi_param SCRIPT_FILENAME /var/www/html/public/index.php;
        fastcgi_param SCRIPT_NAME /index.php;
        fastcgi_param HTTP_HOST $host_with_port;
        include /etc/nginx/fastcgi_params;
    }
}