public ContentPreviewingClient build(HttpClient delegate) {
        return new ContentPreviewingClient(delegate, contentPreviewerFactory,
                                           requestPreviewSanitizer, responsePreviewSanitizer);
    }
Returns a newly-created {@link ContentPreviewingClient} decorating {@code delegate} based on the
properties of this builder.
core/src/main/java/com/linecorp/armeria/client/logging/ContentPreviewingClientBuilder.java