Refreshing modified content

Raymond Hall kova70 at
Fri Dec 17 00:03:16 CET 2010

If you're using apache and mod_expires, you can cusomize you TTLs
pretty specifically, per file type, mime and directory. With that you
can settle for a set of compromise TTLs that suit everybody. Than
again, you can use a proxy aware CMS like pressflow.


On Thu, Dec 16, 2010 at 3:26 PM, Paulo Paracatu
<paulo at> wrote:
> Hi,
> 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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