nginx.conf

worker_processes auto;

events {
  worker_connections 1024;
}

http {
  server_tokens off;
  server {
    listen $PORT;

    location /static/ {
      alias /etc/nginx/html/;
      index index.html;
    }

    location / {
      include /etc/nginx/mime.types;
      location ~.*\.(3gp|gif|jpg|jpeg|png|ico|wmv|avi|asf|asx|mpg|mpeg|mp4|pls|mp3|mid|wav|swf|flv|html|htm|txt|js|css|exe|zip|tar|rar|gz|tgz|bz2|uha|7z|doc|docx|xls|xlsx|pdf|iso)$ {
        expires 1d;
      }
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-NginX-Proxy true;

      proxy_http_version 1.1;
    }
  }
}