- From: Greg Stein <gstein@lyra.org>
- Date: Wed, 24 Apr 2002 23:39:45 -0700
- To: "Webdav WG (E-mail)" <w3c-dist-auth@w3c.org>
On Mon, Apr 22, 2002 at 06:53:34PM +0200, Stefan Eissing wrote: > Am Montag den, 22. April 2002, um 18:36, schrieb Lisa Dusseault: >... > If headers with ETags do not add any value to the protocol. For > GET rfc2616 already defines If-Match and friends. Since the ETag > only captures content changes (property changes have undefined > effect on ETags), IF headers for ETag lack a use case. An etag in an If: header can be used to assert that a file has been unchanged since you last fetched it. Specifically, that you still have the locktoken *or* (you lost it and) it is unchanged. This is to cover the case where lock a file, fetch it, and then attempt to PUT the file back. The PUT should succeed if you have the locktoken *or* if you lost your lock but the etag matches what you GET'd (thus: nobody else changed it). Arguably, the semantic could be manufactured with other combinations, but I'd suggest that is your use case. Cheers, -g -- Greg Stein, http://www.lyra.org/
Received on Thursday, 25 April 2002 02:38:38 UTC