nginx_config/sites-available/default

server {
  listen 443 ssl http2;
  listen [::]:443 ssl http2;

  root /var/www/html;
  index index.html;

  server_name my.domain.com;

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

  client_max_body_size 5M;
  client_body_buffer_size 256K;

  sendfile on;
  send_timeout 600s;

  location / {
    proxy_pass http://192.168.2.1/;
    include /etc/nginx/snippets/proxy_options.conf;
  }
}