This makes the sagemath package notebook unusable, due to python-flask-index being broken by this problem. I reported the python-flask-index issue at https://github.com/sublee/flask-autoindex/issues/12 and the python-flask issue is being discussed at https://github.com/mitsuhiko/flask/issues/796 and at https://github.com/mitsuhiko/flask/issues/794 The patch in comment https://github.com/mitsuhiko/flask/issues/794#issuecomment-21131348 corrects the problem for me. Direct link: https://github.com/mitsuhiko/flask/commit/44e39ab0
This bug appears to have been reported against 'rawhide' during the Fedora 20 development cycle. Changing version to '20'. More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora20
I believe this is fixed in 0.10.1. Feel free to re-open if it's still an issue and I can take a closer look. :)