Refreshing modified content

Paulo Paracatu paulo at
Thu Dec 16 22:26:28 CET 2010


I read somewhere about backend conditional requests, or GET IMS. As I
understand, that would be exactly what I need. I'd be able to set a low TTL
and yet keep the BW beetween backend-varnish low.

And sorry if I sound rude. :P

2010/12/16 Per Buer <perbu at>

> Hi,
> On Thu, Dec 16, 2010 at 9:31 PM, Paulo Paracatu <paulo at>wrote:
>> If I understood it, the purging method isn't automatic, right? I'd need to
>> purge the content everytime it is modified.
> Hi,
> Nobody purges the cache manually. You get your CMS to purge the cache for
> you.
> This is kinda stupid... I host more than 10k sites, modifying files
>> everytime. If I set a high TTL, the backend will be happy and the webmaster
>> will be angry. If I set a low TTL, the webmaster will be happy, but the
>> backend will die. Plus, there is no point using a cache if the TTL is low.
> It isn't stupid, computers don't have intuition and you have to actually
> tell them when you update data. If you can propose another way of getting
> the cache to magically purge itself of stale content please share it with
> us. :-)
> --
> Per Buer, Varnish Software
> Phone: +47 21 98 92 61 / Mobile: +47 958 39 117 / Skype: per.buer
> Varnish makes websites fly!
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