launchpad-dev team mailing list archive

[Robert Collins <robert.collins@xxxxxxxxxxxxx>]

On Fri, Nov 12, 2010 at 9:50 AM, Michael Hudson
<michael.hudson@xxxxxxxxxxxxx> wrote:
> On Thu, 11 Nov 2010 15:44:50 +1300, Robert Collins <robertc@xxxxxxxxxxxxxxxxx> wrote:
>> On Thu, Nov 11, 2010 at 3:27 PM, Michael Hudson
>> <michael.hudson@xxxxxxxxxxxxx> wrote:
>> > A problem with etag is that squid doesn't pay any attention to it. Â But
>> > it will help browsers, I'm sure :-)
>>
>> ?!
>
> Well, I'm probably simplifying grossly.  What I wanted to happen was
> that if you have a squid in front of loggerhead that if a request comes
> in from the internet for a page (with no If-None-Match header) and squid
> has the page cached, that squid would check the validity of the cache by
> making a request to loggerhead with an If-None-Match and if that
> returned 304, squid should return the page from its cache.  I couldn't
> get this to happen.  My understanding was that mod_disk_cache would do
> this.
>
> It was quite a while ago, I've forgotten details and was quite probably
> mistaken even at the time...

2001-05-30 If-None-Match etag queries
On cache misses for varying object If-None-Match is now used to query
the origin server which (if any) of the caced entities matches the
request.
2001-05-30 If-None-Match cache validation
If-None-Match is now used on cache validations, using the entity tag
of the exact object being validated. This ensures that even sub-second
updates are detected properly, and cache validation is now less time
sensitive.

its done it for a long time :)

-Rob