It's json that you would need to return. Example, if you return the following json (application/json):
{ "Framed-IP-Address": "100.1.2.3", "Blah": true, "Weather": "cool"}
And the following filter in your Authentication Source:

And you will see this in Access Tracker:

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Herman Robers
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Original Message:
Sent: May 08, 2023 07:40 AM
From: Arno_st
Subject: Authentication source with HTTP API
Hello,
I try to find some information on how to setup an authentication source that rely on a external DB, but accessed via HTTP REST.
I find the basics to create it, but I didn't find the return format required by Clearpass (Clear text, JSON, ...)
Any link or advice on it ?
Thanks
arno