anchor.diff:  -spec terminate(Reason :: term(), req(), #{}) -> ok.
   terminate(_, _, #{changes_stream := Stream}) ->
       gen_changes:stop(Stream).
  -%%    ok.
   
   %%--------------------------------------------------------------------
   %% @doc @equiv pre_handler:allowed_methods/2
  
positive.code:     {[
          {<<"application/json">>, set_file_attribute}
      ], Req, State}.
  
  
  %%%===================================================================
  %%% Content type handler functions
  
negative.code:         end, NewSince, infinity),
      State#{changes_stream => Stream, ref => Ref}.
  
  %%--------------------------------------------------------------------
  %% @doc
  %% Listens for events and pushes them to the socket
  