self.request.GET['hub.verify_token'] error

[AhsanSheraz]

def get(self, request, *args, **kwargs):
        try:
            print(self.request.GET)
            token = self.request.GET['hub.verify_token']
        except MultiValueDictKeyError:
            print("hhhhhhhhhh")
            token = False

        if token == VERIFY_TOKEN:
            return HttpResponse(self.request.GET['hub.challenge'])
        else:
            return HttpResponse('Error, invalid token')

it returned <QueryDict: {}>