ActivityPub: An Inbox is Not a Queue

It’s not unusual to see AP Fediverse posts discussing message queue middleware and message brokers and pondering whether using them is conformant with “inboxes” as defined in the ActivityPub Recommendation (AP). The answer is that conformance is not relevant because an inbox is not a queue. AP discusses an inbox from two perspectives: inbox endpoints … Read more

ActivityPub: A Box is not a Timeline

A key concept in the ActivityPub specification is the inbox and outbox. These are ordered collections of activities where the inbox contains activities received from other actors (typically on other servers) and the outbox contains activities produced by the actor owning the outbox. The inbox is part of the Server-to-Server (S2S) protocol that implements federation … Read more