unable to get folders for a user #8

I am trying to use Folders api to get all folders or all documents in a particular folder. My code is based on the python example and the authorization work with other API calls like list all documents.

    session['token'] = mendeley_session.token
    folders_req = {}
    response = requests.get(url= "https://api.mendeley.com/folders/",json=folders_req)
    response_dict = json.loads(response.text)
    print (response_dict)
    response = requests.get(url= "https://api.mendeley.com/folders/2a6b304b-5b59-493e-a4b6-92fcf065db05",params={
        'id': '2a6b304b-5b59-493e-a4b6-92fcf065db05'
    })

where '2a6b304b-5b59-493e-a4b6-92fcf065db05' is one of the folders in my library
I get the following response for the two API calls above
{'errorId': 'oauth/NOT_AUTHORIZED', 'message': 'Could not access resource because: No auth header'}
Are these API calls no longer allowed?