On Jan 30, 2009, at 10:31 AM, Finlay Boo wrote:
Looking into this, I'm thinking that my issue is that, as my site in
an
intranet, whereby all users are authenticated then caching can be a
problem
with even subtle content variations such as the user's name
displaying in
the personal bar. The vast majority of users see the site version of
the
site but there are occasional pages which are limited to a small
number of
users.
Therefore, as I would guess that an intranet with Active Directory
authentication is a reasonably, popular configuration can any one
advise how
they've configured their container caching? I currently have this
set with
'cache-with-etag' for authenticated users:
Cache Templates in Memory: Not checked
Last Modified Header; Yes
Etag Header: Yes
Enable 304s: Yes
Vary Header: Yes
max-age : 0
s-maxage: 0
Cache control Header: must revalidate: yes
Cache control Header: public: yes
(All other Cache control Headers are unset)
I'm using CacheFu 1.2 with Plone 3.1.7 with Apache (but no squid or
varnish
as yet)
Anyone who has been through hours of tweaks and enjoyed successful
results
care to share?
There is very little you can do, cache-wise, for personalized views
except for what you have done here. Although I would delete the Last-
Modified Header as you can specify this info in an Etag and there are
cases in IE where specifying both can cause incorrect behavior. Also
unset the 'public' cache control token as this is only needed to
communicate that it's okay to store the content into a shared cache
(set the 'private' token instead). You should also make sure the Etag
has all the components it needs to ensure the most current page can be
fully specified.
In other words, what you want is the original settings for the 'cache-
with-etag' shipped with the default policy. :-)
One potential way to open up all sorts of caching possibilities for an
authenticated view is to tweak the site templates to de-personalize
the views. Not easy but it can be done as long as the only
personalized bits are those usernames, logout links and the like.
Ric
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