On Tue, 24 Nov 2009 00:23:58 +0100, Henrik Nordstrom
<henrik_at_henriknordstrom.net> wrote:
> mån 2009-11-23 klockan 15:34 +0100 skrev Sébastien WENSKE:
>> Sorry I've make a mistake, the url to get the original picture is
>>
http://gallery.wenske.fr/wallpapers/holland_dream_2560x1600.jpg.html?z&p=full-image
>>
>> This will force the download of the picture.
>
> That's a very very cache-unfriendly object..
>
> Some key elements from the response header:
>
> Expires: Thu, 19 Nov 1981 08:52:00 GMT
>
> Cache-Control: no-store, no-cache, must-revalidate, post-check=0,
> pre-check=0
>
> Pragma: no-cache
>
> Last-Modified: Mon, 23 Nov 2009 23:14:13 GMT
>
> Vary: Accept-Encoding
>
>
>
> And my comments:
>
> Expires is set in the past, which forces caches to revalidate the object
> on each request.
>
> Cache-Control no-store is a very aggressive nocache directive. Forbids
> everyone involved from storing the response on any form of persistent
> storage. I.e. not even browsers are allowed to cache the object in their
> disk cache, and they must also remove it as soon as possible from the
> memory cache. Really only intended for very sensitive responses where it
> would be a major disaster if an unauthorized third party got hold of the
> response by stealing the computer and inspecting the cached files and
> similar scenarios.
>
> Cache-Control no-cache & must-revalidate, also quite unfriendly and says
> that the response MUST be validated with the origin before reuse.
... added to all that...
According to redbot.org:
"An If-Modified-Since conditional request returned the full content
unchanged."
Amos
Received on Mon Nov 23 2009 - 23:43:57 MST
This archive was generated by hypermail 2.2.0 : Tue Nov 24 2009 - 12:00:04 MST
