this post was submitted on 13 Jun 2023
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Good technical explanation of ActivityPub? (feddit.de)
submitted 1 year ago by [email protected] to c/[email protected]
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Can anyone recommend a good article or video explaining how ActivityPub works on a technical level? I understand the concept, but I'm interested how the protocol actually works (I am studying CS for context).

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[–] [email protected] 3 points 1 year ago

TL;DR, each user is an Actor, which has an inbox for receiving objects and activities, and an outbox for sending them. The objects are essentially structured metadata that various actions can be performed on. When you respond to a status, for example, your Actor is performing a Reply activity and sends out a Note object. Following another Actor, on the other hand, would be your Actor sending another Actor a Follow activity.

This implementor's guide might be helpful to understand some of what's going on underneath the hood: https://socialhub.activitypub.rocks/pub/guide-for-new-activitypub-implementers

Some useful specs can be found here: