As of December 13, 2020, the website freehttps.lumito.net will be permanently closed. If you want to generate SSL certificates, I recommend using certbot (if you have root access) or acme.sh (if you don’t have root access). However, if you still want to use this service, you can visit it’s creator website: gethttpsforfree.com.
I apologize any inconvenience that this decision could have.