Rails - Aug 2005 - All items getting refreshed when sweeping cached RSS

Hello list,

I have your average plain old RSS feed, which I''m caching using
caches_page, and sweeping using a simple FeedSweeper cache sweeper
(which just calls expire_page(..path..) in an after_save).

The problem is that, than when I''m sweeping the cache, the whole feed
gets marked as new (in netnewswire at least). I''ve noticed the same
thing on a bunch of Typo based blogs out there...

Is there some magic header I''m missing? All the items in the feed have
a unique guid and so on, so the feedreader must look at something
else, what could be causing it to see the whole feed as new?

Cheers,
JS

-- 
http://johansorensen.com
http://theexciter.com

Hi !

Johan Sörensen said the following on 2005-08-26 03:40:
> Is there some magic header I''m missing? All the items in the feed
have
> a unique guid and so on, so the feedreader must look at something
> else, what could be causing it to see the whole feed as new?
I would think your server is sending the cache file''s date and time 
stamp as part of the headers, as in Last-Modified: <timestamp>.  When 
that changes, your feed reader considers the feed as new ?

Hope that helps,
François

On 8/26/05, François Beausoleil <fbeausoleil-IQIa899fVSs@public.gmane.org>
wrote:
> Hi !
> 
> Johan Sörensen said the following on 2005-08-26 03:40:
> > Is there some magic header I''m missing? All the items in the
feed have
> > a unique guid and so on, so the feedreader must look at something
> > else, what could be causing it to see the whole feed as new?
> 
> I would think your server is sending the cache file''s date and
time
> stamp as part of the headers, as in Last-Modified: <timestamp>.  When
> that changes, your feed reader considers the feed as new ?
> 
> Hope that helps,
> François
Yes, but it shouldn''t consider every item new.  That''s what
the guids
are for.  Do you have a sample feed?


-- 
rick
http://techno-weenie.net

On 26-aug-2005, at 9:40, Johan Sörensen wrote:
> Hello list,
>
> I have your average plain old RSS feed, which I''m caching using
> caches_page, and sweeping using a simple FeedSweeper cache sweeper
> (which just calls expire_page(..path..) in an after_save).
>
> The problem is that, than when I''m sweeping the cache, the whole
feed
> gets marked as new (in netnewswire at least). I''ve noticed the
same
> thing on a bunch of Typo based blogs out there...
>
> Is there some magic header I''m missing? All the items in the feed
have
> a unique guid and so on, so the feedreader must look at something
> else, what could be causing it to see the whole feed as new?
I think this is exactly something the makers of Atom tried to  
overcome - thir GUIDs should actually work.
Try the same with atom and report the results if it works out.

-- 
Julian "Julik" Tarkhanov