I'm having trouble getting these redirects to work under all conditions. I'm hoping I can fix it with .htaccess but there may be something mucked up with the way I'd previously tried to force redirects through my host's control panel.
Anyway, olddomain.com/whatever, with http:// or https:// and with or without www should permanently redirect to https://www.newdomain.com/whatever.
At one point I had everything except https://olddomain.com redirecting properly. Now I've broken it and I'm just getting the too many redirects error.
I believe both domains have a Let's Encrypt certificate attached to them. The old domain doesn't need to be secured if that makes a difference.