String user = ctxt.getUser(); String name = ctxt.getItem();  if (user == null || name == null) throw new DavException("invalid uri", HttpServletResponse.SC_FORBIDDEN, null);  Collection col = UrlNamespace.getCollectionAtUrl(ctxt); if (col instanceof CalendarCollection) throw new DavException("can't create calendar under another calendar", HttpServletResponse.SC_FORBIDDEN, null);  col.mkCol(ctxt, name, MailItem.TYPE_APPOINTMENT); ctxt.setStatus(HttpServletResponse.SC_CREATED);
	public void handle(DavContext ctxt) throws DavException, IOException {		ctxt.getResponse().addHeader(DavProtocol.HEADER_CACHE_CONTROL, DavProtocol.NO_CACHE);	}