How to use REST Client with 2 URL with 1 authentication

I am implementing transformation to get data web service with REST Client.

This website need to be log in first for authentication.

So I have to make 2 URL ( 1 for authentication and another one for get data)

I try to make 2 steps of REST Client as below image



The first REST client step I use Post Method for login : I can login properly

The second REST client step I use Get Method to get data : I got the message "First you need to login to ..."



It seem these 2 REST Client steps work with individual connection.

If I use just 1 REST Client, how can I make the URL dynamically for login and get data ?

Any idea to make it work ?

Thank you