The Caddyfile snippet is available at ghost-docker/caddy/snippets/ActivityPub at main · TryGhost/ghost-docker · GitHub and can be imported as shown in the Caddyfile example here: ghost-docker/caddy/Caddyfile.example at main · TryGhost/ghost-docker · GitHub . The ACTIVITYPUB_TARGET variable should be set to https://ap.ghost.org/ but can also be a custom server URL if you self-host an ActivityPub server.
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