docs: public HttpMessage getHttpMessage() throws HttpMalformedHeaderException, DatabaseException {
  		if (httpMessage != null) {
  			return httpMessage;
  		}
  
  		// fetch complete message
  		RecordHistory history = staticTableHistory.read(historyId);
  		if (history == null) {
  			throw new HttpMalformedHeaderException("No history reference for id " + historyId + " type=" + historyType);
  		}
  		// ZAP: Init HttpMessage HistoryReference field
  		history.getHttpMessage().setHistoryRef(this);
  		return history.getHttpMessage();
  	}