Adjust to spec

Author: oneiros

fasp_data_sharing/app/controllers/fasp_data_sharing/fasp/data_sharing/v0/announcements_controller.rb

@@ -7,7 +7,7 @@ def create
       event.process
 
       respond_to do |format|
-        format.json { head :ok }
+        format.json { head :no_content }
       end
     end
 

fasp_data_sharing/app/models/fasp_data_sharing/activity_pub_object.rb

@@ -8,7 +8,7 @@ class FaspDataSharing::ActivityPubObject
 
   def fetch
     response = message_signature_request
-    response = signature_request if response.status == 401
+    response = signature_request if response.status.in?([401, 403])
 
     response.raise_for_status
     JSON.parse(response.body.to_s) # TODO: simplify with response.json after next httpx release