Symfony 2 Nginx configuration with php-fpm and maintenance file

# List of upstream php servers
upstream project_php_fpm {
    least_conn;
    ip_hash;
    server 127.0.0.1:9101;
    server 127.0.0.1:9102;
}

proxy_cache_path /home/user/project/nginx/cache levels=1:2 keys_zone=project_cache:10m max_size=10g inactive=60m; # use_temp_path=off;

fastcgi_cache_path /home/user/project/nginx/fcgicache levels=1:2 keys_zone=project_fcgicache:100m inactive=60m;

server {
    listen *:80;

    server_name project.com www.project.com;
    root /home/user/project/web;

    access_log /home/user/project/logs/access.log;
    error_log /home/user/project/logs/error.log;

    # strip app.php/ prefix if it is present
    rewrite ^/app\.php/?(.*)$ /$1 permanent;

    location / {
        # Turn on maintenance if maintenance.html exists
        if (-f $document_root/maintenance.html) {
            return 503;
        }

        index app.php;
        try_files $uri @rewriteapp;
    }

    location @rewriteapp {
        rewrite ^(.*)$ /app.php/$1 last;
    }

    set $skip_cache 0;

    # POST requests should always go to PHP
    if ($request_method = POST) {
        set $skip_cache 1;
    }

    # pass the PHP scripts to FastCGI server from upstream phpfcgi
    location ~ ^/(app|info)\.php(/|$)|/status {

        fastcgi_cache project_fcgicache;
        fastcgi_cache_bypass $skip_cache;
        fastcgi_no_cache $skip_cache;
        fastcgi_cache_key "$scheme$request_method$host$request_uri$args";
        fastcgi_cache_valid 200 60m;
        #fastcgi_ignore_headers Cache-Control Expires Set-Cookie Vary;

        # Pass request to php-fpm pools
        fastcgi_pass project_php_fpm;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
        fastcgi_param DOCUMENT_ROOT $realpath_root;
        fastcgi_param HTTPS off;

        # Change application environment here
        fastcgi_param APP_ENV dev;
    }

    # Static files rule-set
    location ~* ^.+\.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf|css|js|html)$ {
        # Set rules only if the file actually exists.
        if (-f $request_filename) {
            access_log off;	
            expires 30d;
        }

        proxy_cache project_cache;
        proxy_cache_key $host$uri#is_args$args;
        proxy_cache_valid 200 304 12h;
        proxy_cache_valid 302 301 12h;
        proxy_cache_valid any 1m;

        # Rewrite to app.php if the requested file does not exist.
        try_files $uri @rewriteapp;
    }

    # Maintenance mode error settings
    error_page 503 @maintenance;
    location @maintenance {
        open_file_cache_valid 0s;
        rewrite ^(/maintenance\.png)$ /$1 break;
        rewrite ^(.*)$ /maintenance.html break;
    }

    # Return 404 for any other php file
    location ~ \.php(/|$) {
        # Write this request to separate log
        access_log /home/user/project/logs/access-php.log;
        # Keep log in access.log too
        access_log /home/user/project/logs/access.log;

        return 404;
    }

    # Deny all .ht* files with 404 response
    location ~ /\.ht {
        return 404;
    }
}