Pool Selection base on HTTPS Request

Here's a similar request which should have the same answer...

 

 

I have separate irules for my http and https VIPs doing identical pool selection but the only difference is that the http irule has some http -> https redireects.

 

 

For ease of management I would like to create a single irule for both http and https.

 

 

What trigger do I use to say if the http_request is http do the redirect to https but skip it if it's not.