Noeljunior [1] filed a orphan request for python2-flask-principal [2]:

Apparently the source now requires SSL. Some user pointed this out on 20180201 and the maintainer still didn't update. I didn't flag and out of date because the source version is still the same.

[1] https://aur.archlinux.org/account/Noeljunior/ [2] https://aur.archlinux.org/pkgbase/python2-flask-principal/