old_contents: from django.conf.urls import url, include
  from rest_framework import routers
  from . import views
  
  router = routers.DefaultRouter()
  
  # Wire up our API using automatic URL routing.
  # Additionally, we include login URLs for the browseable API.
  urlpatterns = [
      url(r'^api/v1/', include(router.urls)),
      url(r'^api/v1/change/', views.ChangePost.as_view()),
  ]
  
new_contents: from django.conf.urls import url
  from . import views
  
  
  # Wire up our API using automatic URL routing.
  # Additionally, we include login URLs for the browseable API.
  urlpatterns = [
      url(r'^api/v1/change/', views.ChangePost.as_view()),
  ]
  
subject: remove url duplication