anchor.diff:        check_params(Req, State#state{database=Database});
       _Error ->
         _ = lager:info("unknown database requested: ~p~n", [Database]),
  -      {ok, Req3, S} = barrel_http_reply:error(400, "unknown database", Req, State),
  +      {ok, Req3, _S} = barrel_http_reply:error(400, "unknown database", Req, State),
         {stop, Req3}
     end.
   
  
positive.code:   Params = cowboy_req:parse_qs(Req),
    case parse_params(Params, StateDefault) of
      {error, {unknown_param, _}} ->
        {ok, Req2, S} = barrel_http_reply:error(400, "unknown parameter", Req, State),
        {stop, Req2};
      {ok, State2} ->
        check_eventsource_headers(Req, State2)
  
negative.code: 
  route(#{method := <<"GET">>} = Req, State) ->
    check_database_db(Req, State);
  route(Req, _State) ->
    {ok, Req2, _} = barrel_http_reply:error(405, Req, []),
    {stop, Req2}.
  
  check_database_db(Req, State) ->
  