[Python] API request works in browser, but, doesn't work in Postman or Python requests module

I am trying to request this API: https://iso19139echnap.geocat.live/geonetwork/srv/api/0.1/groups/11864 it works in browser if I enter it as a direct URL, but it doesn't work in Python Request module or in Postman.

Python code looks like the following:


import requests

payload = {
'username': 'corey',
'password': 'testing'
}
r = requests.get('https://iso19139echnap.geocat.live/geonetwork/srv/api/0.1/groups/11864')

print(r)
--------------------------------------------------------
returns
<Response [400]>

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