@Override
    public DefaultServiceConfigSetters accessLogFormat(String accessLogFormat) {
        return accessLogWriter(AccessLogWriter.custom(requireNonNull(accessLogFormat, "accessLogFormat")),
                               true);
    }
A default implementation of {@link ServiceConfigSetters} that stores service related settings
and provides a method {@link DefaultServiceConfigSetters#toServiceConfigBuilder(Route, String, HttpService)}
to build {@link ServiceConfigBuilder}.
core/src/main/java/com/linecorp/armeria/server/DefaultServiceConfigSetters.java