Mark, Just create a wiki page in wiki.squid-cache.org and kick-start this.
Adrian On Sun, Jun 08, 2008, Mark Nottingham wrote: > +1 to what H says. I'm definitely interested in this area, but want to > think through it a bit more. > > We can get a certain amount of functionality without any extension; > e.g., canonicalising selecting headers to take care of whitespace and > case issues, and perhaps even ordering (this doesn't work for generic > headers, but where we know the semantics and ordering isn't > significant, it isn't a problem). > > That doesn't take care of the qval problem, but it helps in the accept- > encoding case, which is the most common (I don't often see qvals on a- > e; anybody?). One of my concerns about X-Vary-Options (can we please > drop the 'X-'?) is that there are non-obvious corner cases; it forces > the origin server admin to think very carefully about all the > different variants that they're going to issue, and the request > headers that will match them. If we can get rid of the common cases by > canonicalisation, they will have less opportunity to mess things up. > > Also, it's important to realise that at some point it's more > worthwhile to take an approach like TCN and describe the available > variants, rather than match against selecting headers. > > Cheers, > > > > On 07/06/2008, at 5:19 PM, Henrik Nordstrom wrote: > > >On l?r, 2008-06-07 at 10:43 +0800, Adrian Chadd wrote: > >>I think some of their stuff was backed out of Squid-2.7 before > >>release. > > > >The Vary invalidation patch was backed out from 2.7 as it's incomplete > >and broke things. > > > >But this X-Vary-Options patch never got committed. Thread stops after > >your request for him to file a bugzilla entry, and it got lost in the > >noise until found again by Mark. > > > >I have concerns about the completeness about this patch, for example > >if > >it handles q values properly. It's not such abig deal on > >Accept-Encoding, but can get quite messy if applying this to Accept or > >Accept-Language. > > > >For Accept* heaers I think it needs to be extended with an option > >instructing caches to parse the Accept* header to a limited degree, > >which means the cache needs to know the list of available choices for > >the header at the server and their order of priority. > > > >Also, for cookie it needs to be a little more elaborate as most often > >one wants to match on cookie names, not their vaule.. and sometimes a > >value of a specific cookie. > > > >Regards > >Henrik > > > > -- > Mark Nottingham [EMAIL PROTECTED] > -- - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial Squid Support - - $25/pm entry-level VPSes w/ capped bandwidth charges available in WA -
