CodeIgniter on nginx using PHP FPM

upstreams.conf

upstream php5438 {
    server 127.0.0.1:5438;
}

virtual.conf

server {
    listen       80;
    server_name  codeigniter.local;
    root /var/www/CodeIgniter-2.2.1;
    autoindex on;
    index index.html index.htm index.php;
    access_log /var/log/nginx/codeigniter.local.access.log combined;
    error_log /var/log/nginx/codeigniter.local.error.log;

    location / {
        try_files $uri $uri/ /index.php;
        location = /index.php {
            fastcgi_pass php5438;
            fastcgi_index index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }
    }

    location ~ \.php$ {
        return 444;
    }
}