https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-load-balancing-with-ssl-termination
https://www.nginx.com/blog/nginx-ssl/#:~:text=End%2Dto%2DEnd%20Encryption&text=In%20this%20case%20the%20clients,center%20with%20the%20backend%20servers.