nginx - nginx + thin 配置 nginx 提供 assets rails ( nginx + thin, config nginx server static assets)

an example from railsgirlschina.com:

(notice :  root for location ~ ^/assets/ is : /opt/app/siwei/rails_girls_cn/shared; , but not : /opt/app/siwei/rails_girls_cn/shared/assets

  server {
          listen       80; 
          server_name  www.railsgirlschina.com railsgirlschina.com www.railsgirlsbeijing.com railsgirlsbeijing.com;
          charset utf-8;
          location / { 
              proxy_pass          http://rails_girls_site;
              proxy_redirect      default;
              proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
              proxy_set_header    X-Real-IP $remote_addr;
              proxy_set_header    Host $http_host;
              proxy_next_upstream http_502 http_504 error timeout invalid_header;
          }   
          location ~ ^/assets/ {
            root /opt/app/siwei/rails_girls_cn/shared;
            expires 1y; 
            add_header Cache-Control public;
            add_header ETag ""; 
            break;
          }   
  }
  upstream rails_girls_site{
    server localhost:3560;
    server localhost:3561;
  }