Nginx Config for Rails 3.1 with Unicorn and Asset Pipeline

nginx_rails_3_1

upstream app {
	server unix:/srv/app/current/tmp/sockets/unicorn.sock fail_timeout=0;
}
server {
        listen   80;
        server_name  www.app.com;
        rewrite ^/(.*) http://app.com/$1 permanent;
}

server {
	listen 80;
	client_max_body_size 2G;
	server_name app.com;
	keepalive_timeout 5;
	root /srv/app/current/public;
	access_log  off;
	error_log off;

	if ($request_method !~ ^(GET|HEAD|PUT|POST|DELETE|OPTIONS)$ ){
		return 405;
	}

	location ~ ^/(assets)/  {  
		gzip_static on;
		expires     max;
		add_header  Cache-Control public;
	} 

	location / {
		try_files $uri/index.html $uri.html $uri @app;
		error_page 404              /404.html;
		error_page 422              /422.html;
		error_page 500 502 503 504  /500.html;
		error_page 403              /403.html;
	}

	location @app {
		proxy_pass http://app;
	}

	location = /favicon.ico {
		expires    max;
		add_header Cache-Control public;
	}

	location ~ \.php$ {
		deny  all;
	}

}