Fediverse HTTP Signatures — Complete Reference
Overview
ActivityPub does not specify an authentication mechanism in its core spec.
In practice, the Fediverse has converged on HTTP Signatures (draft-cavage-12,
formally draft-cavage-http-signatures) for server-to-server authentication.
When one server POSTs an activity to another server's inbox, it signs the
request so the receiving server can verify the sender's identity.
The spec being used is draft-cavage-http-signatures-12 — an
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