Comment 2 for bug 1610624

What OS/version does this happen on?
It seems there are incompatibilities between certain reqeusts/urllib3 versions, which might be triggered by mixing the lib installations via apt-get and pip.

The problem is that Variety is packaged as a deb and can depend on Ubuntu packages (e.g. python-requests, python-urllib3), not on pip requirements, so it't not easy to require a specific version - it might not be in the repos.