@diogo Thank you for your explanation. Now I really see a page on the loadaverage site that tells its server version. And #AndStatus still successfully connects to the server (I'm writing to you using it).
This means that the authentication problem that I reported is caused by a configuration of a concrete server, and not by the latest version of #GnuSocial :-)
Using a chance to talk with you, I hope that you will find time for Client-to-Server #ActivityPub API also. I'm extending support of that API in AndStatus, and already see that not only #Pleroma, but even some #Mastodon sites begin to implement some parts of the API, allowing a Client app to request information directly from its sources, without a need to duplicate it. E.g. Notes by an Actor may be requested from the Actor's profile (from the Actor's outbox) at his site, and not from the server, at which the User of the Client app has an account...
@colegota @xrevan86