anchor.diff:                     leo_misc:get_value('reading_chunked_obj_len',  HttpConf, 0),
                      leo_misc:get_value('threshold_of_chunk_len',   HttpConf, 0),
                      %% config-3:watchdog
  -                   leo_misc:get_value('cpu_enabled',    WatchdogProps),
  -                   leo_misc:get_value('io_enabled',     WatchdogProps),
  +                   exchange_value(?BOOL_TO_ENABLE,
  +                                  leo_misc:get_value('cpu_enabled', WatchdogProps)),
  +                   exchange_value(?BOOL_TO_ENABLE,
  +                                  leo_misc:get_value('io_enabled',  WatchdogProps)),
                      leo_misc:get_value('watch_interval', WatchdogProps),
                      leo_misc:get_value('rex_max_mem_capacity', WatchdogProps),
                      leo_misc:get_value('cpu_max_cpu_load_avg', WatchdogProps),
  
positive.code:                                 "                 cache expire : ~w\r\n",
                                  "        cache max content len : ~w\r\n",
                                  "           ram cache capacity : ~w\r\n",
                                  "       disc cache capacity    : ~w\r\n",
                                  "       disc cache threshold   : ~w\r\n",
                                  "       disc cache data dir    : ~s\r\n",
                                  "       disc cache journal dir : ~s\r\n",
                                  "  -- large-object-related --\r\n",
                                  "        max # of chunked objs : ~w\r\n",
                                  "          chunk object length : ~w\r\n",
                                  "            max object length : ~w\r\n",
                                  "   reading_chunked_obj_length : ~w\r\n",
                                  "    threshold of chunk length : ~w\r\n",
                                  "\r\n[config-3: watchdog]\r\n",
                                  "                 cpu watchdog : ~w\r\n",
                                  "                  io watchdog : ~w\r\n",
                                  "          monitoring interval : ~w\r\n",
  
negative.code: 
      WatchdogProps = leo_misc:get_value('watchdog', State, []),
  
      io_lib:format(lists:append(["[config-1: basic]\r\n",
                                  "  -- basic --\r\n",
                                  "                      version : ~s\r\n",
                                  "                      log dir : ~s\r\n",
                                  "  -- http-server-related --\r\n",
                                  "          using api [s3|rest] : ~w\r\n",
                                  "               listening port : ~w\r\n",
  