anchor.diff:  
       RequestHeaders4 = [?OBJECT_CONTENT_TYPE_HEADER, ?CDMI_VERSION_HEADER, user_1_token_header(Config)],
       {ok, Code4, _Headers4, _Response4} = do_request(Workers, ToCreate4, put, RequestHeaders4, []),
  -    ?assertEqual(201, Code4),
  +    ?assertEqual(?HTTP_201_CREATED, Code4),
   
       ?assert(object_exists(Config, ToCreate4)),
       ?assertEqual(<<>>, get_file_content(Config, ToCreate4)),
  
positive.code:     %%------ update user metadata of a file ----------
      RequestBody7 = #{<<"metadata">> => #{<<"my_new_metadata">> => <<"my_new_value">>}},
      RawRequestBody7 = json_utils:encode(RequestBody7),
      {ok, 204, _, _} = do_request(Workers, FileName, put, RequestHeaders1, RawRequestBody7),
      {ok, 200, _Headers7, Response7} = do_request(Workers, FileName ++ "?metadata:my", get, RequestHeaders1, []),
      CdmiResponse7 = (json_utils:decode(Response7)),
      ?assertEqual(1, maps:size(CdmiResponse7)),
      Metadata7 = maps:get(<<"metadata">>, CdmiResponse7),
  
negative.code:     %%--- get /dir 1/ by objectid ----
      RequestHeaders5 = [?CDMI_VERSION_HEADER, user_1_token_header(Config)],
      {ok, Code5, _Headers5, Response5} = do_request(WorkerP2, "cdmi_objectid/" ++ binary_to_list(DirId) ++ "/", get, RequestHeaders5, []),
      ?assertEqual(?HTTP_200_OK, Code5),
      CdmiResponse5 = json_utils:decode(Response5),
      Meta2 = maps:remove(<<"cdmi_atime">>, (maps:get(<<"metadata">>, CdmiResponse2))),
      CdmiResponse2WithoutAtime = maps:put(<<"metadata">>, Meta2, CdmiResponse2),
  