public ContentPreviewerFactoryBuilder binary(
            BiFunction<? super HttpHeaders, ? super ByteBuf, String> producer,
            BiPredicate<? super RequestContext, ? super HttpHeaders> predicate) {
        requireNonNull(predicate, "predicate");
        requireNonNull(producer, "producer");
        previewSpecsBuilder.add(new PreviewSpec(predicate, PreviewMode.BINARY, producer));
        return this;
    }
Sets the specified {@link BiPredicate} to produce the preview using the specified
{@link BiFunction} when the predicate returns {@code true}.
core/src/main/java/com/linecorp/armeria/common/logging/ContentPreviewerFactoryBuilder.java