IsAuthenticated Permission is not working

[anjadriano16]

When creating a post and there's no user logged in, the result shows "Authentication credentials were not provided", something like that.
When I'm trying to create a post and there's no user logged in, it doesn't show the message above. It still proceed in creating.

What do I need to do?

This the code the I used.

from rest_framework.generics import (
CreateAPIView,
DestroyAPIView,
ListAPIView,
UpdateAPIView,
RetrieveAPIView,
RetrieveUpdateAPIView
)

from rest_framework.permissions import (
AllowAny,
IsAuthenticated,
IsAdminUser,
IsAuthenticatedOrReadOnly,

)

from posts.models import Post

from .permissions import IsOwnerOrReadOnly

from .serializers import (
PostCreateUpdateSerializer,
PostDetailSerializer,
PostListSerializer
)

class PostCreateAPIView(CreateAPIView):
queryset = Post.objects.all()
serializer_class = PostCreateUpdateSerializer
permission_classes = [IsAuthenticated]

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

class PostDetailAPIView(RetrieveAPIView):
queryset = Post.objects.all()
serializer_class = PostDetailSerializer
lookup_field = 'slug'
#lookup_url_kwarg = "abc"

class PostUpdateAPIView(RetrieveUpdateAPIView):
queryset = Post.objects.all()
serializer_class = PostCreateUpdateSerializer
lookup_field = 'slug'
permission_classes = [IsAuthenticatedOrReadOnly, IsOwnerOrReadOnly]
#lookup_url_kwarg = "abc"
def perform_update(self, serializer):
serializer.save(user=self.request.user)
#email send_email

class PostDeleteAPIView(DestroyAPIView):
queryset = Post.objects.all()
serializer_class = PostDetailSerializer
lookup_field = 'slug'
#lookup_url_kwarg = "abc"

class PostListAPIView(ListAPIView):
queryset = Post.objects.all()
serializer_class = PostListSerializer