This is an HTTPS authenticated feed. I can't give you an example because it's my employer's internal feed. However, the open-source reader Vienna handles authenticated feeds, so you could look at their code to see how they do it.
Yep, HTTP auth here. I pull rss feeds from Atlassian's Confluence and JIRA. I could put the user/pass in the URL but I'm not up for doing that. At the moment I'm using NetNewsWire, which supports private feeds.
This is the use case i fit:
> need to view wiki posts, see comments as they are posted without needing to be signed in an viewing the dashboard or wishing to receive email notifications.
> New posts, comments, etc, in Confluence are pushed out through RRS (use the confluence feed builder to create feed).
> use reader to access feed, authentication required.
> Everyone is happy because Caffeinated can do it.