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;
	server_name app.com;
	root /srv/app/current/public;
	access_log /var/log/nginx/app_access.log;
	error_log /var/log/nginx/app_error.log;
	rewrite_log on;

	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.com;
    proxy_redirect     off;

    proxy_set_header   Host             $host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;

    client_max_body_size       10m;
    client_body_buffer_size    128k;

    proxy_connect_timeout      90;
    proxy_send_timeout         90;
    proxy_read_timeout         90;

    proxy_buffer_size          4k;
    proxy_buffers              4 32k;
    proxy_busy_buffers_size    64k;
    proxy_temp_file_write_size 64k;
  }

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

  location ~ \.php$ {
  	deny  all;
  }

}