old_contents: """server URL Configuration
  
  The `urlpatterns` list routes URLs to views. For more information please see:
      https://docs.djangoproject.com/en/1.8/topics/http/urls/
  Examples:
  Function views
      1. Add an import:  from my_app import views
      2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
  Class-based views
      1. Add an import:  from other_app.views import Home
      2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
  Including another URLconf
      1. Add an import:  from blog import urls as blog_urls
      2. Add a URL to urlpatterns:  url(r'^blog/', include(blog_urls))
  """
  from django.conf.urls import include, url
  from django.contrib import admin
  
  from django.contrib.auth.models import User
  from rest_framework import routers, serializers, viewsets
  from rest_framework.authtoken import views
  
  # Serializers define the API representation.
  class UserSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = User
          fields = ('url', 'username', 'email', 'is_staff')
  
  # ViewSets define the view behavior.
  class UserViewSet(viewsets.ModelViewSet):
      queryset = User.objects.all()
      serializer_class = UserSerializer
  
  # Routers provide an easy way of automatically determining the URL conf.
  router = routers.DefaultRouter()
  router.register(r'users', UserViewSet)
  
  # Wire up our API using automatic URL routing.
  # Additionally, we include login URLs for the browsable API.
  urlpatterns = [
      url(r'^admin/', include(admin.site.urls)),
      url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
      url(r'^api/token-auth/', views.obtain_auth_token),
      url(r'^api/', include(router.urls)),
      url('^', include('django.contrib.auth.urls')),
  ]
  
new_contents: """server URL Configuration
  
  The `urlpatterns` list routes URLs to views. For more information please see:
      https://docs.djangoproject.com/en/1.8/topics/http/urls/
  Examples:
  Function views
      1. Add an import:  from my_app import views
      2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
  Class-based views
      1. Add an import:  from other_app.views import Home
      2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
  Including another URLconf
      1. Add an import:  from blog import urls as blog_urls
      2. Add a URL to urlpatterns:  url(r'^blog/', include(blog_urls))
  """
  from django.conf.urls import include, url
  from django.contrib import admin
  
  from django.contrib.auth.models import User
  from rest_framework import routers, serializers, viewsets
  from rest_framework.authtoken import views
  
  # Serializers define the API representation.
  class UserSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = User
          fields = ('url', 'username', 'email', 'is_staff')
  
  # ViewSets define the view behavior.
  class UserViewSet(viewsets.ModelViewSet):
      queryset = User.objects.all()
      serializer_class = UserSerializer
  
  # Routers provide an easy way of automatically determining the URL conf.
  router = routers.DefaultRouter()
  router.register(r'users', UserViewSet)
  
  # Wire up our API using automatic URL routing.
  # Additionally, we include login URLs for the browsable API.
  urlpatterns = [
      url(r'^admin/', include(admin.site.urls)),
      url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
      url(r'^api/v1/token-auth/', views.obtain_auth_token),
      url(r'^api/v1/', include(router.urls)),
      url('^', include('django.contrib.auth.urls')),
  ]
  
subject: Add version for api urls.