@Deprecated
    @Nullable
    public ZonedDateTime getCreationDate() {
        return this.creationDate;
    }
Return the value of the {@literal creation-date} parameter, or {@code null} if not defined.
@deprecated since 5.2.3 as per
<a href="https://tools.ietf.org/html/rfc6266#appendix-B">RFC 6266, Appendix B</a>,
to be removed in a future release.
manager/api/rest-impl/src/main/java/io/apiman/manager/api/rest/impl/util/ContentDisposition.java