Calibre Companion and Basic Authentication

I have calibre content server running as a reverse proxy behind Apache, and am using basic authentication on this server.

Generally I can get apps to connect to my server via something like:

This works for all the usual suspects (sabnzbd, sickbeard, etc) - and works fine for Calibre too in general.

I have tried the 'full url' option and entering the above, but Calibre Companion won't connect.

I believe reverse proxies are in general ok - but what about those using basic auth? Any ideas on this one?

I thought I would post here first so that future searchers could benefit from the discussion as this is quite a common setup these days.