[Zope] HTTP Cache & Zope (Relative/Absolute URL's, seperate s ervers)

[sean.upton@uniontrib.com]

As someone previously said, use a VHM or something similar to Virtual Hos=
t
with Squid+ZServer.  That said, if you use a redirector with Squid to get
VHM interaction working (you would have to, actually - you don't have a
choice, I suggest searching freshmeat.net for pyredir), you should be awa=
re
that what gets cached is actually based on the back-end URL.  I think tha=
t
most well-behaving CMF tools using the getURL() function for an object wi=
ll
work with a VHM just fine, as long as your templates or scripts use this
rather than the physical path to lookup URLs...

If, by chance you are using ZEO, you want to keep your back-end Zope serv=
ers
using the same back-end URLs if you have more than one (for example, with
ZEO); compile Squid with --disable-internal-dns and use Squid's external
dnsserver process to resove from /etc/hosts to manage the names of your
back-end servers (Squid will round-robin among all IPs with the same
hostname in /etc/hosts) this way.

Sean

-----Original Message-----
From: Jean-Francois.Doyon@CCRS.NRCan.gc.ca
[mailto:Jean-Francois.Doyon@CCRS.NRCan.gc.ca]
Sent: Tuesday, May 14, 2002 10:50 AM
To: zope@zope.org
Subject: [Zope] HTTP Cache & Zope (Relative/Absolute URL's, seperate
servers)


Hello,

I am working onn adding Squid to my Zope setup to speed things up, but am
wondering abour the URL's.

In many parts of the site, and even in the default setup of CMF for examp=
le,
absolute URL functions are used.

Now, this becomes a problem if I want to run Squid on a separate machine,
since I'm guessing Zope will guess it's URL as being different from what =
is
being used by the user.

If I have http://mydomain.com setup as the Squid cache, but the Zope site
actually lives at http://nocache.mydomain.com , Zope will give URL output=
s
as the "nocache" version, which is a problem, since I want Zope to *think=
*
it's actually on mydomain.com ...

Has anybody run into this problem ? How do I get around it ? For my own
stuff it's easy enough, but in the case of CMF content, it's a problem si=
nce
a lot of the skin stuff uses absolute paths ....

Help?!

Thanks,

Jean-Fran=E7ois Doyon
Internet Service Development and Systems Support
GeoAccess Division
Canadian Center for Remote Sensing
Natural Resources Canada
http://atlas.gc.ca
Phone: (613) 992-4902
Fax: (613) 947-2410



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