Reverse Proxy to two different URLs using ARR from single host

I have a website hosted on my local machine at:

localhost:8081

I have to send an AJAX request to a remote sever where I have another application running, it's address is:

192.168.200.158:80/app 

I have configured reverse proxy to this address successfully, and I am sending http requests. The problem is that I also have to send some AJAX requests to another URL from the same localhost:8081website, the other URL is:

192.168.200.158:7071/app-web 

How can I handle these multiple addresses? thanks for any help.