No SSL (only HTTP) on an app?

I encounter problems with HTTPS on some apps, and would like to proxy them on HTTP only.

I have a reverse proxy of a local app (local IP) using redirect_ynh. For some reason, I didn’t manage to wrote the nginx conf file to allow HTTP. It always forces me into HTTPS. Do you have any tips please? Is there some line I should put somewhere? Is it forced by YNH or the moulinette ?

For another app (PHP this time), I have the same problem because it contains an iframe to a local app (Kofi) which works only on HTTP. Because the YNH app (jeedom) is HTTPS, the iframe is also forced into HTTPS, and it doesn’t work

Thanks for your help

Sorry to bother.
Does anybody have an idea how to force HTTP without SSL on a certain nginx please?
I have some appa that don’t support being proxies through HTTPS.