public static Function<? super HttpService, LoggingService> newDecorator() {
        return builder().newDecorator();
    }
Returns a new {@link HttpService} decorator that logs {@link HttpRequest}s and {@link HttpResponse}s at
{@link LogLevel#DEBUG} for success, {@link LogLevel#WARN} for failure. See {@link LoggingServiceBuilder}
for more information on the default settings.
core/src/main/java/com/linecorp/armeria/server/logging/LoggingService.java