Django filters with APIVIew return the complete queryset

Question

I'm trying to use django filter with APIVIew like I saw in this post and I'm geting an unexpected behavior: If the word passed on filter doesn't exists, it return nothing - OK If the word passed on filter exists, it return the complete queryset.

I tried to use filters with ModelViewSet before and it works, but I have no success with APIView. I'm using the following code:

views:

from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import APIView
from core.models import Profile
from core.serializers import ProfileSerializer
from django_filters.rest_framework import DjangoFilterBackend


class ProfileFilter(DjangoFilterBackend):

    def filter_queryset(self, request, queryset, view):
        filter_class = self.get_filter_class(view, queryset)

        if filter_class:
            return filter_class(request.query_params, queryset=queryset, request=request).qs

        return queryset


class ListProfileView(APIView):
    serializer_class = ProfileSerializer
    filter_fields = ('nome', 'link')
    queryset = Profile.objects.all()

    def get(self, request, format=None):
        queryset = Profile.objects.all()

        ff = ProfileFilter()
        filtered_queryset = ff.filter_queryset(request, queryset, self)

        if filtered_queryset.exists():
            serializer = self.serializer_class(queryset, many=True)
            return Response(serializer.data, status=status.HTTP_200_OK)
        else:
            return Response([], status=status.HTTP_200_OK)


    def post(self, request, format=None):
        serializer = self.serializer_class(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

model:

from django.db import models


class Profile(models.Model):
    nome = models.CharField(max_length=200, null=False, blank=False)
    link = models.CharField(max_length=200, null=False, blank=False)

serializers:

from rest_framework.serializers import ModelSerializer

from core.models import Profile


class ProfileSerializer(ModelSerializer):
    class Meta:
        model = Profile
        fields = '__all__'