private void logIoException(final IOException exception, final long elapsedTime) {
    if (logLevel != Logger.Level.NONE) {
      logger.logIOException(metadata.configKey(), logLevel, exception, elapsedTime);
    }
  }
Logs IO exception.

@param exception IO exception
@param elapsedTime time spent to execute request
vertx/feign-vertx/src/main/java/feign/VertxMethodHandler.java