Alternatively, simply add Request.evaluatePreconditions() with no
arguments that would indicate that the resource does not exist. This
would be backwards compatible.
Gili
Paul Sandoz (via Nabble) wrote:
>
> On Jan 20, 2009, at 2:25 AM, Gili wrote:
>
> >
> > I hope I didn't jump the gun, but upon taking at the Jersey source-
> > code I
> > don't think it is technically possible to get this to work. I filed
> > https://jersey.dev.java.net/issues/show_bug.cgi?id=185 but I believe
> > this is
> > actually a bug in the specification. It's my understanding that Marc
> > Hadley
> > reads this mailing list so hopefully he will run across this post.
> >
>
> Yes, i think this is an oversight in the spec.
>
> So what you are proposing is if a null value for an entity tag is
> passed in then the application is stating the resource does not exist.
> And a null value will be returned for the case of If-None-Match: * is
> present.
>
> We may be able to resolve in the maintenance release, but i need to
> discuss with Marc.
>
> A workaround is to do the following:
>
> public void put (...., @HeaderParam("If-None-Match") String value) {
> if (value.equals("*") {
> } else {
> }
> }
>
> Paul.
>
> > Gili
> >
> >
> > Gili wrote:
> >>
> >> Hi,
> >>
> >> My client issues an HTTP PUT with If-None-Match: * because it
> >> wishes to
> >> ensure the operation only proceeds if the resource does not already
> >> exist.
> >> I'm not sure how to implement this using
> >> Request.evaluatePreconditions on
> >> the server side. I want to be able to support both If-None-Match and
> >> If-Match headers on the server.
> >>
> >> If the resource doesn't exist then I can't invoke
> >> Request.evaluatePreconditions(EntityTag) because I have no
> >> EntityTag. If I
> >> omit this call altogether but the client specifies If-Match:
> >> <value> then
> >> I will fail to handle this header and the call with go ahead even
> >> though
> >> it should not. Any ideas?
> >>
> >> Thank you,
> >> Gili
> >>
> >
> > --
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> >
> >
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