HTTPS redirection for all routes node.js/express - Security concerns

Question

I recently took a stab at setting up HTTPS on a node/express server. I have successfully managed to redirect all the routes to use https using the code below:

Answer 1

function requireHTTPS(req, res, next) {
    if (!req.secure) {
        //FYI this should work for local development as well
        return res.redirect('https://' + req.get('host') + req.url);
    }
    next();
}

app.use(requireHTTPS);
app.get('/', routeHandlerHome);

The middleware approach will work because express will run the middleware in the order added, before it runs the router, and in general this kind of site-wide policy is cleaner as middleware vs. a wildcard route.

Regarding question 2 about sniffing session cookies, that must be addressed by marking the cookies as secure when you set them. If they haven't been marked secure, the browser will transmit them with HTTP requests as well, thus exposing them to sniffing.