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"Threads.net has joined the Fediverse, and it is already blocking some servers. It uses a feature called Authorized fetch to ensure those servers cannot even fetch content from Threads. If your server is blocked, you can work around it by configuring a separate domain on your Rebased install to use only for fetching data."

Describes 5 potential attacks related to context retrieval.

Learn how to implement the OAuth 2.0 protocol with practical examples and important nuances you should be aware of.

OAuth 2.0 Simplified is a guide to building an OAuth 2.0 server.

(2017) Unofficial (non-normative) discussion of authentication and authorization for ActivityPub.