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Re: decreased caching efficiency?
From: Andrew Bangs <andrewb () demon net>
Date: Thu, 19 Oct 2000 18:36:03 +0100

On Thu, Oct 19, 2000 at 12:28:04PM -0400, Daniel Senie wrote:

It might be worth thinking about the problem from the other end. From a
web site owner's perspective, caching is a major annoyance. Here are the
arguments you may encounter from a web site owner or web developer:

Agreed. It's an annoyance. It could be considered a cost of doing

1. It interferes with content in many cases (web site visitors may see
cached pages instead of current content). I know cache products claim
this doesn't happen, but it has, and often.

Then the content probably needs fixing. (eg with caching primitives)

2. The website owner loses information on how many visitors are coming
to the site.

Then the content probably needs fixing. (make the smallest object
uncachable, perhaps with use of caching primitives, an empty cgi, a
bit of javascript etc)

3. The website owner loses the demographics on where visitors are coming
from, and especially the number of unique visitors. (It's not helpful to
know that one cache engine visited, if that cache engine equated to
10,000 visits in an hour).

Sometimes that's just tough luck (some people use caches/proxies to
protect their own identities). Other times the content could be fixed
(cookies. ugh.)

4. Banner advertising may or may not display properly when caching is
involved, thereby costing the website money.

This is an orthogonal problem. The website owner doesn't control
whether or not caching is involved so she should pay more attention
to making sure that the banner advert is done in a way that works
in either case!  The secondary issue of needing to know when banner
ads are seen... well, maybe the content could be fixed to help that

5. There's NOTHING in it for the website owner, other than the
possibility that SOME pages might display faster for SOME users.

Don't website owners pay for bandwidth anymore? :-)

If folks running networks really think website designers and owners
should care about caching, then there needs to be some sort of benefit
(perhaps paid in dollars) to those affected. Otherwise, there's little
reason for them to care.

Some website owners need to remember that some Internet users don't
use a cache/proxy out of choice, but because their ISP forces all
(web) traffic through it. Not taking caching into account when
designing a website is fine if the website owner knows the setup
that all her customers will be using (like an internal corporate
website), and it's fine if the owner doesn't want all those things
you mention to work with all the audience, but it seems like a silly
idea for -this- Internet.

andrewb () demon net

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