nginx.conf

upstream app_name {
    server unix:/usr/local/app_name/tmp/sockets/unicorn.sock;
}

server {
    listen 80;

    server_name localhost;
    root /usr/local/app_name/public;
    server_tokens off;
    access_log /var/log/nginx/app_name_access.log;
    error_log /var/log/nginx/app_name_error.log;

    location / {
      try_files $uri $uri/index.html $uri.html @app_name;
    }

    location @app_name {
      proxy_read_timeout 300;
      proxy_connect_timeout 300;
      proxy_redirect off;

      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;

      proxy_pass http://app_name;
    }
}