Re: CORS and 304

On Wed, Apr 8, 2015 at 6:41 AM, Mark Nottingham <mnot@mnot.net> wrote:
> You only get a 304 (legitimately) when you send a conditional request, and the browser will only send a conditional request when it has something in cache — but that thing is stale (hence the conditional request).

Right. And in that case the requesting party sees a 200 (or whatever
was cached I supposed), not a 304. Looking forward to your suggestions
on fixing this.


> If the client-side code is generating the conditional request and trying to handle the 304 themselves, yes it's a problem (and IIRC we left that as unsolveable last time around).

In that case we should probably require same-origin-or-CORS (the
current code path). Otherwise we might end up exposing bits in the 304
response that were not meant to be seen. But I guess we should also
see what browsers do here if that's not yet covered.


> IIRC it was the stuff you asked me to add around Access-Control-Expose-Headers.

Ah okay, so browsers fail at combining headers?


-- 
https://annevankesteren.nl/

Received on Wednesday, 8 April 2015 04:52:52 UTC