anchor.diff:      {[
           {<<"application/json">>, set_file_attribute}
       ], Req, State}.
  -
   
   %%%===================================================================
   %%% Content type handler functions
  
positive.code: -spec terminate(Reason :: term(), req(), #{}) -> ok.
  terminate(_, _, #{changes_stream := Stream}) ->
      gen_changes:stop(Stream).
  %%    ok.
  
  %%--------------------------------------------------------------------
  %% @doc @equiv pre_handler:allowed_methods/2
  
negative.code:         {Ref, Change = #change{seq = Seq, doc = Doc, model = Model}} ->
              ?info("CHANGE: ~p", [Change]),
              stream_loop(SendChunk, State)
      after
          Timeout ->
              ok
  