what is the mandatory field in header of request after getting the ibasetoken

After generating itoken what should be mandatory field of Request Headers,

i am using the following format please let me know where i am missing :

e.g python language: getting lun count :

headers = {"content-type": "application/json", "accept": "application/json", "iBaseToken":"XXXXXX"}

url  = "https://%s:8088/deviceManager/rest/%s/lun/count" % (ip, deviceid)

requests.get(baseurl + "/xxxxx/sessions", headers=headers, verify=False)

Please let me know if anything mandatory field missing on Request Header,

Rest API Document does n't say about which field is mandatory on request Header.  should have some example.