Until HTTP header when the representation will disappear in the future

[Karl Dubost <[e-mail]>]

Hi, 

I was wondering if people had already imagined a mechanism to warn about the decay, or the non persistence of a URI. No bikeshed yet about the name let's call it "zardoz" instead of "Valid-until".

Let's say a document will be obsolete for legal reasons, contests, sunsetting Web sites or APIs, etc. after midnight on June 24 and I want to say to user agent that it will be 410 Gone after this date and/or a temporary redirect will be finished at a precise date (maintenance for example).


→ http HEAD http://example.org/

HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: max-age=600
Content-Length: 34322
Content-Type: text/html; charset=utf-8
Date: Wed, 12 Jun 2013 05:36:14 GMT
Last-Modified: Tue, 11 Jun 2013 21:57:50 GMT
Zardoz: Wed, 24 Jun 2013 23:59:59 GMT


Is there already a way to do this that I would have missed. 
The semantics of Expire is not exactly the same.

-- 
Karl Dubost
http://www.la-grange.net/karl/