How to extract the session id from a POST request in a REST API connection?

[JPanzer]

Hi,
I have the following problem:
I need to extract some data through a REST API connection.
In the first step, i created a POST connection to receive the bearer token I need to make the GET request.
This works just fine.
But, in addidtion, I need the session ID, which has to be in the url I get. 
In Insmonia, if O do the POST request, it is shown to me in the timeline, but it is not part of the JSON including the token.

Do you have any idea how I could extract the ID (or, in a first step, how to show the URL I am getting back from the POST request)?

Thanks in advance,

Julian