Re: Proposal for a way to avoid a round-trip on every POST when dealing with large numbers of URIs

On Thu, 31 Jan 2008 15:19:36 +0100, Thomas Roessler <tlr@w3.org> wrote:
> On 2008-01-30 22:09:57 +0000, Ian Hickson wrote:
>> When a 200 OK OPTIONS response (i.e. after following redirects)
>> has this header, the path in the header is compared to the path
>> of the 200 OK response itself. If the path in the header doesn't
>> start with a slash, then add a slash at the start of the path. If
>> the path in the header doesn't end with a slash, then add a slash
>> to it. If the path, with the added slashes if any, is an exact
>> prefix match for the URI of the 200 OK response itself, but is
>> not an exact match for that URI, then the whole process of
>> sending OPTIONS requests is repeated, with the URI consisting of
>> the same scheme, host, and port as the 200 OK response, and the
>> path given in the header, without the added slash at the end if
>> one was added.
>
> I'd propose one material (but not very deep) change here: Define
> that header to hold a URI reference which - if relative - is
> resolved with the request's URI as the base.  Then, perform an
> origin comparison between that URI and the request URI; then the
> remaining magic as currently specified (except for the "prepend a
> slash" part which is now redundant).

In what case would the origin comparison fail here? Resolving the path  
(and then appending a / if not present) does make more sense to me, but I  
can't think of a scenario where origin comparison would be needed after a  
path is resolved against a URI. I mean, what path can change the origin of  
said URI?


> (I'm assuming here that "the URI of the 200 OK response" is meant to
> be the request URI of the OPTIONS request that caused this
> response.)
>
> Rationale: This permits (a) pinning things to one particular host
> name on the target side in case of interestingly configured virtual
> hosting environments (which might ignore Host headers), and (b)
> might open the door for later extensions if we'd ever decide that
> delegating authority across origins is a good idea.


-- 
Anne van Kesteren
<http://annevankesteren.nl/>
<http://www.opera.com/>

Received on Monday, 4 February 2008 13:22:51 UTC