code: public void checkBrowserType(final HttpServletRequest request) {
      String reqpar = request.getParameter(getBrowserTypeRequestName());
  
      if (reqpar != null) {
        if (reqpar.equals("!")) {
          // Go back to unsticky browser type
          setBrowserTypeSticky(false);
        } else {
          setBrowserType(reqpar);
          setBrowserTypeSticky(false);
        }
      }
  
      reqpar = request.getParameter(getBrowserTypeStickyRequestName());
      if (reqpar != null) {
        if (reqpar.equals("!")) {
          // Go back to unsticky browser type
          setBrowserTypeSticky(false);
        } else {
          setBrowserType(reqpar);
          setBrowserTypeSticky(true);
        }
      }
    }
docs: Allow user to explicitly set the browser type.
  
  @param request  Needed to locate parameters