I am unable to add an URL for whitelisting in CORS settings. Im facing trouble when i try to add an URL from the communities visual force template page for a challenge on TrailHead. As asked i have copy pasted the URL and when i try to save it it is not saving. I have tried to use domain name which i have created while creating communities and even when i try to whitelist that URL i am unsuccessful.This is the URL i am trying to whitelist.

https://brave-moose-17221-dev-ed--c.ap5.visual.force.com