Why is req.xhr always false?

Question

Node.js

There is a test SPA site, the content is rendered by axios. Everything works fine, and when you would like to redirect to the main page during a normal page refresh, if not an hxr request, the problem is that req.xhr is always false

app.get('/test', function (req, res) {

// получаю с БД данные
//....

// только так пока что добился редиректа если не xhr
    if (res.type('xhr').req.headers.accept === 'application/json, text/plain, */*') {
        res.set('X-Requested-With', 'XMLHttpRequest')
        res.render('test', {
            title: 'Test',
            test: result, // в шаблон pug данные из бд
        })
        console.log(req.xhr) // false
    } else {
        console.log(req.xhr)
        res.redirect('/')
    }
});

I saw that the type is xhr and the X-Requested-With header is set, but console.log(req.xhr) // false. I can't understand why this is so, and is there another way to determine the request type in express?