code: public void show(RequestManager requestManager, ActionRuntime runtime, InOutLogKeeper keeper) {
          if (!isLoggerEnabled()) { // e.g. option is true but no logger settings
              return;
          }
          if (isExceptLogging(requestManager, runtime, keeper)) { // e.g. HealthcheckAction
              return;
          }
          // no async for now, because this process is after response committed by jflute (2017/08/11)
          try {
              doShowInOutLog(requestManager, runtime, keeper);
          } catch (RuntimeException continued) { // not main process
              logger.info("*Failed to show in-out log: " + runtime.getRequestPath(), continued);
          }
      }
docs: ======