Set ALLOWED_HOSTS in settings.py
Set ALLOWED_HOSTS in settings.py

https://docs.djangoproject.com/en/1.8/releases/1.5/#allowed-hosts-required-in-production

libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar