we have dev.our-root-domain.com in public DNS pointing to 127.0.0.1

I've run into resolvers that filter things like that to prevent dns rebinding attacks. And localhost (the hostname) does not work for CORS.

Best option is probably to set dev.our-root-domain.com in /etc/hosts

	▲	whalesalad 4 hours ago \| parent [-]
		Haven't had an issue yet, with a team scattered across US, Canada and UK. I'm sure it's possible - but so far we've been using this for about 3 years with no hiccups.