Alex Brelsfoard wrote:
> Part of the img src does include a large random number.
> On top of that I have also checked the temporary internet folder and I
> see multiple copies (with different random numbers) of the same image
> there.

That would suggest it is working. At least from the browser's perspective.


> I have run this test with a cleared cache, and with previous copies in cache.
> the results do not vary.
> This makes no sense to me either.

After you clear the cache, do you exit and restart the browser? 
(Insuring that the IE process actually terminated before restarting it?) 
It may be caching the file in memory. (You'd think clearing the cache 
would clear the memory too, but who knows, could be a bug in IE7.)

The other option to consider is the involvement of a caching proxy. Is 
IE configured to use a proxy? Try running a packet sniffer to see where 
it is actually connecting. You might also be faced with a transparent 
caching proxy at an ISP, which you won't be able to bypass from the 
client side, but should have the same effect on all browsers running on 
the machine running IE7.

One reason why you might see differences among browsers even if there is 
a transparent caching proxy is that the browsers might use different 
headers in the request. A packet sniffer would bring that to light.

Have you explored setting the headers from the server side of things? If 
this is just a simple image bug used for tracking purposes, you could 
throw together a CGI with a few lines of code that sets the headers and 
returns the image. There are probably scripts already available that do 
this.

  -Tom

-- 
Tom Metro
Venture Logic, Newton, MA, USA
"Enterprise solutions through open source."
Professional Profile: http://tmetro.venturelogic.com/
 
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