sendbackOriginalDoc(mp, contentType, context.resp);
sendbackOriginalDoc(mp, contentType, context.req, context.resp);
    private void handleMessagePart(Context context, MailItem item) throws IOException, ServiceException, MessagingException, UserServletException {        if (!(item instanceof Message))            throw UserServletException.notImplemented("can only handle messages");        Message message = (Message) item;                MimePart mp = getMimePart(message, context.getPart());        if (mp != null) {            String contentType = mp.getContentType();            if (contentType == null) {                contentType = Mime.CT_APPLICATION_OCTET_STREAM;            }            sendbackOriginalDoc(mp, contentType, context.resp);            return;        }        context.resp.sendError(HttpServletResponse.SC_BAD_REQUEST, "part not found");    }