Noeljunior  filed a orphan request for python2-flask-principal :
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 I didn't flag and out of date because the source version is still the same.
 https://aur.archlinux.org/account/Noeljunior/  https://aur.archlinux.org/pkgbase/python2-flask-principal/
Request #10994 has been accepted by Eschwartz .