I'm trying to support proper logout (or as good as it gets with HTTP authentication). I've found using the https://email@example.com syntax works just fine for me in the browser. The user is logged out as I would expect and a new login is required to continue. Unfortunately, using this as the logout URL in the plugin causes the '@' to be stripped (https://logoutsomeurl.com).
I tried using proper URL encoding (%40%), but this didn't seem to work either.