splunk - python - requests.post Authentication error

[vamsigurram]

The below code is throwing error.

{"messages":[{"type":"WARN","text":"call not properly authenticated"}]}

r = requests.get(base_url+"/servicesNS/admin/search/auth/login", data={'username':username,'password':password}, verify=False)

    sessionkey = minidom.parseString(r.text).getElementsByTagName('sessionKey')[0].firstChild.nodeValue

    print ("Session Key:", sessionkey)

Output:

Session Key: im0t_JBlWSnQnaWwFCj016^q_QEYutHbpQMBGLEHlxOesSAVh6iQ0X8Y4tcoQR5a4lwr3I2ayDgBVNx0412THyMkON0iO6^Af_2DCYS1F8Eseo

I see Session Key here. No issues so far.

But when I pass the above session key, to the below requests.post, I see the error.

What am I doing wrong here?

url = base_url + "/services/search/jobs?output_mode=json"

    headers = {

    "content-type": "application/x-www-form-urlencoded",    

    "Authorization": "Splunk %s" % sessionkey,           

    }

    payload = {

        "search": "|rest /servicesNS/%s/search/directory" % kouser,

        "count": 0

    }

    r = requests.post(url, headers=headers, data=payload, verify = False)

    print(r.text)

{"messages":[{"type":"WARN","text":"call not properly authenticated"}]}

Is there anything wrong here?