Re: Alt-Svc across a domain?

[Martin Thomson <[e-mail]>]

On 8 April 2016 at 14:31, Ryan Hamilton <[e-mail]> wrote:
> It is common for web sites to serve content from a variety of different
> origins within the same domain. For example, www.example.com,
> accounts.example.com, images.example.com. A single page view may require
> loading resources from several such origins. (Tricks like domain sharing can
> exacerbate this proliferation of origins.) It would be great if the service
> had some way to tell the client, "All of my domains can use this alternative
> service". What would folks thinks of an include-subdomains parameter in the
> Alt-Svc value? If such a parameter were present in an Alt-Svc advertisement,
> a client could use this advertisement to apply to any sub-domain of the
> origin that the client does not already have an alternative for. This would
> avoid the need to discover the alternatives individually.


That shouldn't be necessary.  A server that has coalesced multiple
origins onto the same connection can move as many of those as it wants
by pushing for each of the origins of interest. [50]

[50] I'm going to start recommending that people should push OPTIONS * [51]
[51] NOT!