- From: Mark Nottingham <mnot@mnot.net>
- Date: Fri, 2 Sep 2011 10:30:26 +1000
- To: Julian Reschke <julian.reschke@gmx.de>
- Cc: HTTP Working Group <ietf-http-wg@w3.org>
Looks right to me. I'm a *little* concerned about how productions like this will be handled: If-Match: "abc\", "def" but that's a corner case... On 02/09/2011, at 4:59 AM, Julian Reschke wrote: > On 2011-08-30 13:35, Mark Nottingham wrote: >> <http://trac.tools.ietf.org/wg/httpbis/trac/ticket/306> >> >> IIRC we checked various implementations and found that many don't handle ETags as a quoted-string; therefore, the safe/sensible thing to do is to re-define ETag as a something else; i.e., something with the same syntax, but without any special semantic for backslashes. >> >> We might also caution against including backslashes in them in prose, since it isn't interoperable. >> >> Thoughts / objections? >> >> -- >> Mark Nottingham http://www.mnot.net/ > > Proposed patch: <http://trac.tools.ietf.org/wg/httpbis/trac/attachment/ticket/306/306.diff> > > The definition would then read: > > 2.3. ETag > > The ETag header field provides the current entity-tag for the > selected representation. An entity-tag is an opaque validator for > differentiating between multiple representations of the same > resource, regardless of whether those multiple representations are > due to resource state changes over time, content negotiation > resulting in multiple representations being valid at the same time, > or both. An entity-tag consists of an opaque quoted string, possibly > prefixed by a weakness indicator. > > ETag = entity-tag > > entity-tag = [ weak ] opaque-tag > weak = %x57.2F ; "W/", case-sensitive > opaque-tag = DQUOTE *etagc DQUOTE > etagc = %x21 / %x23-7E / obs-text > ; VCHAR except double quotes, plus obs-text > > Note: Previously, opaque-tag was defined to be a quoted-string > ([RFC2616], Section 3.11), thus some recipients might perform > backslash unescaping. Servers therefore ought to avoid backslash > characters in entity tags. > > ... > > Best regards, Julian -- Mark Nottingham http://www.mnot.net/
Received on Friday, 2 September 2011 00:31:06 UTC