Rewrite URI between F5 and Pool Member

I am in need of rewriting all inbound https requests that hit the front end of my web LTM and direct them to a subsite on the pool member server.

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Internet -> F5 - https://www.abc.com

F5 -> Pool member - http://www.abc.com/subsite

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The internet web browser user should never see the "/subsite" in the URL.

Any help on proper irule syntax to assist with this?

Thanks!

Shawn