Thanks! you gave me one thing to check. The certs are indeed made for 10 years validity, the idea being that they should just make the demo work for a long time

Thanks! you gave me one thing to check. The certs are indeed made for 10 years validity, the idea being that they should just make the demo work for a long time, even if it is with a certificate warning. I don't think it's worth the effort of setting up all the automatic renewal process with Let's Encrypt for what amounts to a quick static code example... so in principle I wanted to avoid having to set that up. The contents of this article means that soon this 2-year maximum will become a 13-month maximum, right? Is there any way to create these specific-purpose certs with some kind of "private use" or "development use" flag that allows not having to re-create them so soon? 13 months looks too short of a time period, I'm afraid nobody will remember to refresh the fake certs and the demos will break... for really no good reason (related to the code itself)