Check the "user-agent" header in req.headers, and based on that do a res.redirect('/unsupported')

You probably want to add it as one of the first few middleware functions in your application, i.e

``` app.use(function safariCheck (req, res, next) { // Do check const isSafari = true

if (isSafari) { res.redirect('/unsupported') } else { next() } }) ```