POST data only if you are authenticated user- django rest framework

models.py

class OpeningHours(models.Model):
    day_of_week = models.IntegerField(choices=((0, 'Sunday'), (1, 'Monday'), (2, 'Tuesday'), (3, 'Wednesday'), (4, 'Thursday'), (5, 'Friday'), (6, 'Saturday')))
    opening_time = models.TimeField()
    closing_time = models.TimeField() 

serializer.py

class OpeningHoursSerializer(serializers.ModelSerializer):
    class Meta:
        model = OpeningHours
        fields = '__all__'
        read_only_fields = ("user",)

views.py

class OpeningHoursViewSet(viewsets.ModelViewSet):
    queryset = OpeningHours.objects.all()
    serializer_class = OpeningHoursSerializer
    authentication_classes = [CustomAuthentication]
    permission_classes = [permissions.IsAuthenticatedOrReadOnly]

    def perform_create(self, serializer):
        serializer.save(user=self.request.user)

authentication.py

class CustomAuthentication(authentication.BaseAuthentication):
    def authenticate(self, request):
        username = request.META.get('HTTP_USERNAME')
        if not username:
            return None
        try:
            user = User.objects.get(username=username)
        except User.DoesNotExist:
            raise exceptions.AuthenticationFailed('No such user')
        return (user, None)

I want only authenticated user to be able to perform POST method . I have set the key as HTTP_USERNAME and value as username (which i have created in django admin) on postman header before making a post request but im still getting error: "detail": "Authentication credentials were not provided." } How so i solve this.

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