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Activitypub Question


So, lets say you look up a user by their address like kevin@friendgroup.social
You do a webfinger query to get their profile page
with their profile url, you can do an activitypub query to get their profile object.
Is there an activitypub query I can run against the domain or profile url to get what kind of server it is? Mastodon, or Pleroma or whatever?