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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