URL Rewrite / Caching

Can someone provide an example of using URL rewriting with caching?

 

 

For example, we use URL re-writing at the F5 to provide vanity or clean URLs. When the request comes back to the server, it get's transformed into a server request will all the querystring parameters, etc.

 

 

We'd now like to add caching into the mix:

 

For example, user requests: http://www.site.com/test/index.html

 

Request gets re-written to web server as http://www.site.com/default.php?sid=1&loc=3

 

 

How would we go about caching the output of this request at the F5 and which URL would be cached - the user requested URL or the re-written URL?

 

 

Any help or sample code you can provide would be greatly appreciated!