server {
  listen ${NGINX_PORT};

  # Nginx will reject anything not matching /api
  location /api {
    # Reject requests with unsupported HTTP method
    if ($request_method !~ ^(GET|POST|HEAD|OPTIONS|PUT|DELETE)$) {
      return 405;
    }

    # Only requests matching the whitelist expectations will
    # get sent to the application server
    proxy_pass http://localhost:3000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_cache_bypass $http_upgrade;
  }
}