Page not found Django restframework

I'm trying to write an API in Django to get the user comments from the URL.

My API is :

class ListSpecificUserCommentsApiView(APIView):    authentication_classes = [authentication.TokenAuthentication]    permission_classes = [permissions.AllowAny]    def get(self, request: HttpRequest, user) -> Response:        username: User = User.objects.get(id=user.id)        comments: Comment = Comment.objects.filter(user=username)        serialized_comments: CommentModelSerializer = CommentModelSerializer(instance=comments, many=True).data        return Response(serialized_comments)

and my urls.py :

urlpatterns = [    path(        route='users',        view=views.ListUsersApiView.as_view(),        name='users',    ),    path(        route='comments/<user>',        view=views.ListSpecificUserCommentsApiView.as_view(),        name='user-comments',    ),]

and still I'm facing this Page not found error.

I tried to pass the user as data in DRF Response like the code below:

class ListSpecificUserCommentsApiView(APIView):    authentication_classes = [authentication.TokenAuthentication]    permission_classes = [permissions.AllowAny]    def get(self, request: HttpRequest, user) -> Response:        username: User = User.objects.get(id=user.id)        comments: Comment = Comment.objects.filter(user=username)        serialized_comments: CommentModelSerializer = CommentModelSerializer(instance=comments, many=True).data        return Response(serialized_comments, data=user)

but it didn't work.