Yesterday I was wondering why the self signed root certificate and the certificates I added to my debian install didn't work with httpie (ssl warning) but did work with curl (and the browsers I added the RootCA to).
I found the explanation: https://github.com/httpie/httpie/issues/480 httpie doesn't look into /usr/local/share/ca-certificates but apparently it's not httpie's fault, it's the python requests library that doesn't check that folder.
I don't know what to think of it and who is supposed to fix it. But I am back to curl with my tail between the legs (because I oversold httpie to my coworkers) for now. There's only one place where the bucket stops with curl.