[Python] How to make ImageField returns relative path?

I don't know why, but my ImageFields return full URL pathes.

This is MEDIA_URL setting:

MEDIA_URL = '/cc/cc/media/'


I use this custom FileStorage:

class ASCIIFileSystemStorage(FileSystemStorage):
def get_valid_name(self, name):
return str(uuid.uuid4()) + '.' + name.split('.')[-1]


And simple ModelSerializers (from django rest framework) without overwriting smth like that for model Module1Item:

class Module1Item(models.Model):
...
background = models.ImageField(blank=True)


class Module1ItemSerializer(serializers.ModelSerializer):
class Meta:
model = Module1Item
fields = '__all__'


What can be the reason of those behaviour? I need relative URLs.

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