localhost domains and HTTP/2 and beyond

[annevk]

It seems somewhat inevitable we might eventually want to migrate beyond HTTP/1 or require HTTP/2 for certain features (e.g., this often comes up with upload streaming). This poses a problem for localhost development (a useful location as it's a secure context) as there's no valid certificate there. Is this something we should tackle or is that the point where localhost ceases to be useful and you have to get a domain somehow?

[TomCJones]

This is similar to the request recently made in OpenID to require https for local host, because it is more secure. I personally use in in production systems to access local resources. I can't image how i would do that if domain names were required.