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