Django Rest Framework序列化图像返回绝对系统url，而不是亚马逊s3 url

STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'static')

from django.db import models

class MyModel(models.Model):
    image = models.ImageField(upload_to='images/')

from rest_framework import serializers

class MyModelSerializer(serializers.ModelSerializer):
    image_url = serializers.SerializerMethodField()

    def get_image_url(self, obj):
        if obj.image:
            return self.context['request'].build_absolute_uri(obj.image.url)
        return None

    class Meta:
        model = MyModel
        fields = ('image', 'image_url')

from django.urls import path
from .views import MyModelAPIView

urlpatterns = [
    path('mymodel/', MyModelAPIView.as_view(), name='mymodel-list'),
]

from rest_framework.views import APIView
from rest_framework.response import Response
from .serializers import MyModelSerializer
from .models import MyModel

class MyModelAPIView(APIView):
    def get(self, request):
        mymodels = MyModel.objects.all()
        serializer = MyModelSerializer(mymodels, many=True, context={'request': request})
        return Response(serializer.data)