Determine the outbox url from the actor’s profile

Post a new Activity
curl --location --request POST 'localhost:8081/actor/rdf-pub-admin/outbox' \
--header 'Accept: application/ld+json' \
--header 'Content-Type: application/ld+json' \
--header 'Authorization: Bearer ***' \
--data-raw '{
   "@context":[
      "https://schema.org/docs/jsonldcontext.json",
      "https://www.w3.org/ns/activitystreams"
   ],
   "type":"Create",
   "version":1,
   "identifier":"1209-sdfje-1835-4444",
   "id":"https://social.example/alyssa/posts/a29a6843-9feb-4c74-a7f7-081b9c9201d3",
   "to":[
      "https://chatty.example/ben/"
   ],
   "actor":"http://localhost:8081/actor/38ce660b-f8a3-4425-bb19-1fbcaef461f2/",
   "object":{
      "type":"Note",
      "id":"https://social.example/alyssa/posts/49e2d03d-b53a-4c4c-a95c-94a6abf45a19",
      "version":1,
      "identifier":"1209-sdfje-1835-j38s",
      "attributedTo":"https://social.example/alyssa/",
      "to":[
         "https://chatty.example/ben/"
      ],
      "content":"Say, did you finish reading that book I lent you?"
   }
}'

You should get an HTTP 201 CREATED Response with a Location Header attribute containing the IRI of the created activity.