While trying to add a feed from MyGet.org (nuget feeds as a service) I got a 404 when entering the url without trailing slash. After adding the trailing slash, the feed was added. Either a hint about that or adding it automaticcly would be great.
MyGet.org allows you to create public feeds as well as private feeds where you can set security/privileges. I believe it uses basic authentication. Is this in your backlog? Fairly easy to implement I believe.
Also, I’m guessing local feeds aren’t supported as they don’t expose an odata point to fetch the data from.