Django token base authentication using python

[Akash utreja]

Hi I am trying to build an authentication system. I have added following in
my setting.py file
REST_FRAMEWORK = {
'DEFAULT_AUTHENTICATION_CLASSES': (
'rest_framework.authentication.TokenAuthentication',
),
'DEFAULT_PAGINATION_CLASS':
'rest_framework.pagination.LimitOffsetPagination'
}
And I also added decorators in my each api functional views as following
@permission_classes((IsAuthenticated,))
Now I am making request to api using token so some them are accessible but
some get unauthorized.And these api which get unathorized are random mean
not a particular api get unauthorized.
Am I missing something?Please help me out here!
Thanks
Akash