http purging multiple accept-encoding entries

[Laurence Rowe]

That example is only for handling wildcard purges. The one above uses
a direct comparison, which is what you want:

    purge("req.url == " req.url);

Your regexp is not doing what you think it's doing either, purging "/"
will purge "/foo/" and "/foo/bar/" as well. You need to anchor it to
the beginning of the string too:

   purge("req.url ~ ^" req.url "$");

This should allow wild card purges to work if you need them.

Laurence

On 10 July 2010 09:24, Chris Hecker <checker at d6.com> wrote:
>
> Awesome, this worked great, thanks!
>
> The one caveat that others might run into was that sometimes the backend
> would sent / as the url, and I was using the regexp ~ version from the link
> you sent, so it would clear the whole cache.  I changed it to this:
>
>                purge("req.url ~ " req.url "$");  # use regexp to handle all
> Accept-Encoding's
>                error 200 "Purged in recv.";
>
> and now it works perfectly.
>
> Chris
>
>
> On 2010/07/09 04:56, Laurence Rowe wrote:
>>
>> On 9 July 2010 12:01, Chris Hecker<checker at d6.com>  wrote:
>>>
>>> I'm trying to put varnish in front of mediawiki, but there are a couple
>>> things going wrong with the purging support built into mediawiki (which
>>> supposedly supports varnish and squid).
>>>
>>> 1.  Mediawiki was sending back an HTTP/1.0 PURGE command, which had no
>>> Host:
>>> header, just the full url after the PURGE, so the hash function wasn't
>>> matching with the normal HTTP/1.1 requests.  I patched mediawiki to fix
>>> this
>>> and send an HTTP/1.1 PURGE with a Host: header, not sure what a better
>>> way
>>> to do this would be.
>>>
>>> 2.  The PURGE does not have an Accept-encoding: on it, so it doesn't
>>> match
>>> the cached object, which is almost always A-e: gzip.  I hacked a gzip
>>> header
>>> onto the PURGE, but what I really want is to purge all the records
>>> associated with an URL.  Is there a way to do this?
>>
>> See: http://varnish-cache.org/wiki/VCLExamplePurging
>>
>> Using purge("req.url == " req.url); should fix both problems.
>>
>> Laurence
>>
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>