docs: public static void setXFrameOptions (@Nullable final EXFrameOptionType eType, @Nullable final ISimpleURL aDomain)
    {
      if (eType != null && eType.isURLRequired ())
        ValueEnforcer.notNull (aDomain, "Domain");
  
      if (eType == null)
      {
        removeResponseHeaders (CHttpHeader.X_FRAME_OPTIONS);
      }
      else
      {
        final String sHeaderValue = eType.isURLRequired () ? eType.getID () +
                                                             " " +
                                                             aDomain.getAsStringWithEncodedParameters ()
                                                           : eType.getID ();
        setResponseHeader (CHttpHeader.X_FRAME_OPTIONS, sHeaderValue);
      }
    }