@UnstableApi
    @Nullable
    default Long defaultRequestAutoAbortDelayMillis() {
        return null;
    }
Returns the amount of time to wait by default before aborting an {@link HttpRequest} when
its corresponding {@link HttpResponse} is complete.
Note that this flag has no effect if a user specified the value explicitly via
{@link ServerBuilder#requestAutoAbortDelayMillis(long)} or
{@link ClientBuilder#requestAutoAbortDelayMillis(long)}.
core/src/main/java/com/linecorp/armeria/common/FlagsProvider.java