upstream app {
  server localhost:3000;
}

server {
  listen 80;
  server_name example.com;
  return 301 https://example.com$requesturi;
}

server {
  listen 443 ssl;
  root /var/www;
  index index.html;
  server_name example.com;

  ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

  error_page 401 403 404 /404.html;

  location / {
    try_files $uri @app;
  }

  location @app {
    proxy_http_version 1.1;
    proxy_pass http://app;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_cache_bypass $http_upgrade;
  }
}

server {
  listen 80 default_server;
  listen 443 default_server;

  server_name _;

  return 404;
}