@Override
        public String toString() {
            return new StringJoiner(", ", MultipartUploadHolder.class.getSimpleName() + "[", "]")
                 .add("filename='" + filename + "'")
                 .add("fileBackedOutputStream=" + fileBackedOutputStream)
                 .add("mediaType=" + mediaType)
                 .toString();
        }
@author Marc Savy {@literal <marc@blackparrotlabs.io>}
manager/api/rest-impl/src/main/java/io/apiman/manager/api/rest/impl/util/MultipartHelper.java