With stuff like "nicknames" being its own extension (xep-0173), the list gets long fast.
Incidentally, that one is missing from jackal's list. I wonder if that means that you can't set or see users' nicknames when using it?
If you mean XEP-0172 then there is no server support required. I don't know why it is on a list of XEPs that a server supports other than the possibility of using server side storage in the form of XEP-0163 (PEP).
Re:Jackal 0.54.1 – Go XMPP Server
by runawaybottle on Friday June 18, 2021 @04:01PM
(#27554332)
You must not have seen sprint planning now days.
Edit: Found it:
https://github.com/ortuman/jackal#supported-specifications
Ejabberd in comparison: https://www.process-one.net/en/ejabberd/protocols/
It’s crazy how much stuff a mature xmpp server can do out of the box.