Using Policy to manage URI /api traffic

I have a case where the application being serviced by a VS 10.xxx.xxx.xxx:443 takes me to a landing login page on a pool, but after keying in user name and Password on the login page, a URI /api traffic is redirected to another port 5446 in the same node.

I have created two pools, one on 443 and the second on 5446 and tried using Policy to manage the traffic from Pool:443 to Pool:5446 but I have this error, when the policy is applied, the landing page on 443 can no longer be reached. how can I set the policy to handle and redirect the traffic after the /API?