old_contents: from django.conf.urls import include, url
  from api import views
  
  urlpatterns = [
      url(r'^services/$', views.services, name='api-services'),
      url(r'^collect/$', views.collect_response, name='api-collect'),
      url(r'^search/text/$', views.text_search, name='api-text-search'),
      url(r'^license/$', views.licensing, name='api-licensing'),
  
      # Oauth2 urls
      url(r'^o/', include('api.oauth2_urls', namespace='oauth2_provider')),
  ]
  
new_contents: from django.conf.urls import include, url
  from api import views
  
  urlpatterns = [
      url(r'^v1/services/$', views.services, name='api-services'),
      url(r'^v1/collect/$', views.collect_response, name='api-collect'),
      url(r'^v1/search/text/$', views.text_search, name='api-text-search'),
      url(r'^v1/license/$', views.licensing, name='api-licensing'),
  
      # Oauth2 urls
      url(r'^o/', include('api.oauth2_urls', namespace='oauth2_provider')),
  ]
  
subject: Add API versioning at the url