return LaRequestUtil.getOptionalRequest().map(req -> (String) req.getAttribute(FessConfig.VIRTUAL_HOST_VALUE)).orElseGet(() -> {
            final String value = processVirtualHost(s -> s, StringUtil.EMPTY);
            LaRequestUtil.getOptionalRequest().ifPresent(req -> req.setAttribute(FessConfig.VIRTUAL_HOST_VALUE, value));
            return value;
        });
    }

    public String appValue;

    @Size(max = 1000)
    public String defaultLabelValue;

    @Size(max = 1000)
    public String defaultSortValue;

    @Size(max = 10000)
    public String virtualHostValue;

    @Size(max = 10)
    public String appendQueryParameter;

    @Size(max = 10)
    public String loginRequired;

    @Size(max = 10)
    public String resultCollapsed;

    @Size(max = 10)