ric at digitalmarbles.com
Thu May 1 22:54:11 CEST 2008
Just poking around the tracker and I noticed some activity on the
example plone vcl. http://varnish.projects.linpro.no/changeset/2634
Just thought I would chime in that the example has issues.
First of all, it's unnecessary to filter cookie-authenticated requests
as authenticated responses are already set with a past date Expires
(although you need to set a default_ttl of zero seconds, http://varnish.projects.linpro.no/ticket/236)
. With CacheFu installed, the default policy gives authenticated
responses a max-age=0. However, some authenticated responses are
rule in the example vcl defeats this strategy.
Also, not every non-authenticated item should be set with a minimum
ttl of 3600 seconds. CacheFu can't yet purge all items reliably when
the view changes. Some view changes may be dependent on changes
elsewhere in the site which currently is hard to track reliably in the
general case. Subsequently, the default policy for some content and
most container views is to NOT cache in the proxy. This is easily
overridden in CacheFu as necessary but again the example vcl defeats
Also, last I heard Varnish strips the conditionals from conditional
requests when passed to the backend. This is unfortunate as one
default CacheFu policy for private items is to "cache" the items only
in the browser with conditional requests ensuring freshness.
Stripping the conditionals defeats this strategy. The solution is to
pass the conditionals in the vcl which the example vcl does not do.
IMHO, a better example of a vcl for plone (for varnish trunk or 1.2)
can be found at:
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