Nesting a redirect to another pool?

Thanks Colin... makes sense.

As I'm not routable to the back-end, taking the Pool tack:

when HTTP_REQUEST {  
 if {[HTTP::uri] equals {www.foo.com/bar}} {pool Bar_pool }  
 }

But I'm getting redirected to https://www.foo.com/bar and then :

404 NOT FOUND

This irule is set to run AFTER the above:

when HTTP_REQUEST { 
 HTTP::redirect https://[HTTP::host][HTTP::uri] 
 }

What am I missing (sorry... new to iRules)?

thanks for your help!!