在wagtail中，我如何设置v2 api来将完整的基本url (例如http://localhost:8000“)附加到蒸汽场图像和富文本嵌入？

from wagtail.api.v2.router import WagtailAPIRouter
from wagtail.images.api.v2.views import ImagesAPIViewSet
from wagtail.documents.api.v2.views import DocumentsAPIViewSet

api_router = WagtailAPIRouter('wagtailapi')
api_router.register_endpoint('images', ImagesAPIViewSet)
api_router.register_endpoint('documents', DocumentsAPIViewSet)

urlpatterns = [
    # 其他URL配置
    path('api/v2/', api_router.urls),
]

from wagtail.core.models import Page
from wagtail.core.fields import StreamField
from wagtail.images.blocks import ImageChooserBlock
from wagtail.embeds.blocks import EmbedBlock

class MyPage(Page):
    body = StreamField([
        ('image', ImageChooserBlock()),
        ('embed', EmbedBlock()),
    ])

from wagtail.api.v2.views import PagesAPIViewSet

class MyPageAPIViewSet(PagesAPIViewSet):
    base_serializer_class = MyPageSerializer

    def get_api_representation(self, instance):
        representation = super().get_api_representation(instance)

        # 获取完整的基本URL
        base_url = self.request.build_absolute_uri('/')[:-1]

        # 更新SteamField图像的URL
        for block in representation['body']:
            if block['type'] == 'image':
                block['value']['url'] = base_url + block['value']['url']

        # 更新富文本嵌入的URL
        for block in representation['body']:
            if block['type'] == 'embed':
                block['value']['url'] = base_url + block['value']['url']

        return representation

api_router.register_endpoint('pages', MyPageAPIViewSet)