WAF - Site path routing is not preserving the full path when directing traffic to the real web server

Hi,

I'm new to Sophos UTM and have started setting up a virtual web server that redirects to a real web server. I've set up site path routing to redirect https://mydomain.co.uk/wea to a specific internal host and this is working but the redirect is not preserving the full site path - i.e.

https://mydomain.co.uk/wea

gets redirected to

https://myinternalhost

How do I get Sophos UTM to preserve the full path?

Any help will be greatly appreciated!

Thanks

David