Activitypub uses ordinary web protocols like https to make requests between servers. It's all quite simple.
This document is quite detailed: https://www.w3.org/TR/activitypub/
this post was submitted on 13 Jun 2023
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Thanks, it is indeed quite simple. I guess the part that confused me was how lemmy communities are modeled. Apparently, they are just actors of type group and submitting a post is simply sending an activity to the group and its followers. So, the email comparison makes sense after all.
Yeah I think it's beautiful. And because of the simplicity, I think the fediverse will take off and many new apps will come. Probably used by techies in the beginning but as soon as some big company makes something, everyone will start to use it.
I'd imagine your best bet is reading through the w3c spec if you want protocol details. I think reading it directly is probably approachable enough for a CS student and should be a good exercise.