@Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                          .add("boundary", boundary)
                          .add("bodyParts", bodyParts)
                          .toString();
    }
A complete multipart whose body parts are readily available.
core/src/main/java/com/linecorp/armeria/common/multipart/DefaultAggregatedMultipart.java