server {
  listen 80 default_server;
  listen [::]:80 default_server;

  server_name _;
  root /usr/www;
  index index.html;

  location / {
    try_files $uri $uri/ =404;
  }

  location ~* .(jpg|jpeg|png|gif|ico|css|js)$ {
    expires 30d;
  }
}