title: Django serializer Imagefield to get full URL
body: <p>I am beginner to Django and currently, I can construct model like this.</p>
  
  <p><a href="https://i.stack.imgur.com/jKi6F.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jKi6F.png" alt="enter image description here"></a></p>
  
  <p>models.py </p>
  
  <pre><code>class Car(models.Model):
      name = models.CharField(max_length=255)
      price = models.DecimalField(max_digits=5, decimal_places=2)
      photo = models.ImageField(upload_to='cars')
  </code></pre>
  
  <p>serializers.py </p>
  
  <pre><code>class CarSerializer(serializers.ModelSerializer):
      class Meta:
          model = Car
          fields = ('id','name','price', 'photo') 
  </code></pre>
  
  <p>views.py </p>
  
  <pre><code>class CarView(APIView):
      permission_classes = ()
      def get(self, request):
          car = Car.objects.all()
          serializer = CarSerializer(car)
          return Response(serializer.data)
  </code></pre>
  
  <p>For photo, it doesn't show full URL. How can I show full URL?</p>