Should you use www or not in your domain? (2017)
The reasons given for using www are honestly very weak, just edge cases really.<p>As far as cookies are concerned, keeping them on the origin ensures they get passed to all subdomains, which is usually a benefit, as opposed to a problem -- which you'll discover when you need to restrict API requests on a subdomain only to logged-in users, for example. And as long as you're keeping your cookie payload small, like a session ID or two, there's zero worry about a performance hit.<p>And as far as a CNAME needing to point to another domain instead of an IP, has that ever been an issue for anyone? Genuinely curious. I'd never even heard of that until now.<p>Honestly, simpler is better and "www." is an unnecessary vestige from another era. I dropped it from my sites starting a couple years ago. (Obviously with a redirect in case anyone ever types it.)