Re: CORS performance proposal

> On 9 Jun 2015, at 2:42 pm, Martin Thomson <> wrote:
> On 8 June 2015 at 21:30, Nottingham, Mark <> wrote:
>> A header denoting site-wide metadata would work for this too, of course, if folks were comfortable with the security properties of doing that (as well as the potential response overhead).
> The security properties bother me a little.  Alt-Svc is showing us
> that we can't just define a header field like that without some
> serious analysis.

Indeed. Also, an intermediary cache (whether a proxy or a CDN) would need to monitor all of the headers sent back for a given origin to figure out the applicable policy, and rewrite responses accordingly. It wouldn't just work out of the box like a .well-known would.


Mark Nottingham

Received on Tuesday, 9 June 2015 04:53:43 UTC