This post is a bit outdated, but I want to still reply if someone is looking for an answer.
First, you need to see if the intercepter is enabled on the toolbar, it is one step away from the input
If it does not activate when you click on it, you can install the extension. I think there is one for Chrome. Go ahead and add the extension.
After that, you can return to Postman and enable intercepter
You can see the cookies in the postman, and at this point you can add _session_id
Hope this helps.
Thanks,
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