XxlSsoWebFilter logoutPageUrl 缺少当前页面地址，退出登录后重新登录无法跳转回来

[IceIceIce]

`
// logout path check
if (logoutPath!=null
&& logoutPath.trim().length()>0
&& logoutPath.equals(servletPath)) {

        // remove cookie
        SsoWebLoginHelper.removeSessionIdByCookie(req, res);

        // redirect logout
        String link = req.getRequestURL().toString().replace(logoutPath,"");
        String logoutPageUrl = ssoServer.concat(Conf.SSO_LOGOUT) + "?" + Conf.REDIRECT_URL + "=" + link;
        res.sendRedirect(logoutPageUrl);

        return;
    }

`