Squid behind Apache on same server to cache images on Amazon S3

[Ivo Beckers | FocusFriends <ivo@xxxxxxxxxxxxxxxx>]

We want to cache images that are stored on Amazon S3. In the  
preferred approach, Squid runs behind Apache (on the same server),  
where a rewriterule assures that only image requests that are stored  
on S3 are handled by Squid. All other HTTP requests should go  
directly to Apache.

Is this possible? And how does this setup look like in terms of  
squid.config, rewriterule, etc?

Here's a sample image stored on S3 (using a CNAME that points to a  
bucket):

http://static.assetdeli.com/aston1.png

cheers, Ivo