code: public SiteNode addPath(HistoryReference ref, HttpMessage msg) {
          return this.addPath(ref, msg, false);
      }
docs: Add the HistoryReference with the corresponding HttpMessage into the SiteMap.
  This method saves the msg to be read from the reference table.  Use
  this method if the HttpMessage is known.
  Note that this method must only be called on the EventDispatchThread
  @param msg the HttpMessage
  @return the SiteNode that corresponds to the HttpMessage