问nodejs res.redirect，但http状态代码为304

EN

app.use(function (req, res, next) {
        var url = req.originalUrl;
        var arr =[];
        arr = req.originalUrl.split('/');
        if (arr[1] != "login" && !req.session.user) {
               return res.redirect(302, "/login");   
        }
        next();
    });