static BodyPart of(ContentDisposition contentDisposition, HttpData content) {
        requireNonNull(content, "content");
        return of(contentDisposition, StreamMessage.of(content));
    }
Returns a new {@link BodyPart} using the specified {@link ContentDisposition} and
{@link HttpData}.
core/src/main/java/com/linecorp/armeria/common/multipart/BodyPart.java