nginx

server
{
	listen 80;
	server_name example_site.ru www.example_site.ru;
	access_log /var/log/nginx.access_log;

	location ~* .(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js|swf|flv|html|htm|mp3|docx|xlsx)$
	{
		root /home/example_site/www.example_site.ru/public_html/;
		error_page 404 = @fallback;
		index index.html index.php;
		access_log off;
		expires 30d;
	}

	location ~ /.ht { deny all; }

	location /
	{
		proxy_pass http://127.0.0.1:81/;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-for $remote_addr;
		proxy_set_header Host $host;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_connect_timeout 60;
		proxy_send_timeout 90;
		proxy_read_timeout 90;
		proxy_redirect off;
		proxy_set_header Connection close;
		proxy_pass_header Content-Type;
		proxy_pass_header Content-Disposition;
		proxy_pass_header Content-Length;
	}

	location @fallback
	{
		proxy_pass http://127.0.0.1:81;
		proxy_set_header Host $host;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $scheme;
		proxy_set_header X-Real-IP $remote_addr;
	}
}