old_contents: from django.conf import settings
  from django.conf.urls import include, url
  from django.conf.urls.static import static
  from django.contrib import admin
  from django.views.generic import TemplateView
  from django.views import defaults as default_views
  from django.http import HttpResponse
  
  from rest_framework.documentation import include_docs_urls
  from rest_framework.authtoken import views as authtokenviews
  
  urlpatterns = [
      url(r'^$', TemplateView.as_view(template_name='pages/home.html'), name='home'),
      url(r'^about/$', TemplateView.as_view(template_name='pages/about.html'), name='about'),
  
      # Django Admin, use {% url 'admin:index' %}
      url(settings.ADMIN_URL, admin.site.urls),
  
      # User management
      url(r'^users/', include('homepage.users.urls', namespace='users')),
      url(r'^accounts/', include('allauth.urls')),
  
      # Your stuff: custom urls includes go here
  
      # Blog
      url(r'^blogs/', include('homepage.blogs.urls', namespace='blogs')),
  
      # CKEditor upload
      url(r'^ckeditor/', include('ckeditor_uploader.urls')),
  
      # Cast Blog
      url(r'^cast/', include('cast.urls', namespace='cast')),
  
      # rest
      url(r'^api/api-token-auth/', authtokenviews.obtain_auth_token),
      #url(r'api/', include('homepage.blogs.api.urls', namespace='api')),
      url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
      url(r'^docs/', include_docs_urls(title='My Blog API service')),
  
      # robots.txt
      url(r'^robots.txt',
          lambda x: HttpResponse("User-Agent: *\nDisallow: /*claas", content_type="text/plain"),
          name="robots_file"),
  
  ] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
  
  if settings.DEBUG:
      # This allows the error pages to be debugged during development, just visit
      # these url in browser to see how these error pages look like.
      urlpatterns += [
          url(r'^400/$', default_views.bad_request, kwargs={'exception': Exception('Bad Request!')}),
          url(r'^403/$', default_views.permission_denied, kwargs={'exception': Exception('Permission Denied')}),
          url(r'^404/$', default_views.page_not_found, kwargs={'exception': Exception('Page not Found')}),
          url(r'^500/$', default_views.server_error),
      ]
      if 'debug_toolbar' in settings.INSTALLED_APPS:
          import debug_toolbar
          urlpatterns = [
              url(r'^__debug__/', include(debug_toolbar.urls)),
          ] + urlpatterns
  
new_contents: from django.conf import settings
  from django.conf.urls import include, url
  from django.conf.urls.static import static
  from django.contrib import admin
  from django.views.generic import TemplateView
  from django.views import defaults as default_views
  from django.http import HttpResponse
  
  from rest_framework.documentation import include_docs_urls
  from rest_framework.authtoken import views as authtokenviews
  
  urlpatterns = [
      url(r'^$', TemplateView.as_view(template_name='pages/home.html'), name='home'),
      url(r'^about/$', TemplateView.as_view(template_name='pages/about.html'), name='about'),
  
      # Django Admin, use {% url 'admin:index' %}
      url(settings.ADMIN_URL, admin.site.urls),
  
      # User management
      url(r'^users/', include('homepage.users.urls', namespace='users')),
      url(r'^accounts/', include('allauth.urls')),
  
      # Your stuff: custom urls includes go here
  
      # Blog
      # url(r'^blogs/', include('homepage.blogs.urls', namespace='blogs')),
  
      # CKEditor upload
      url(r'^ckeditor/', include('ckeditor_uploader.urls')),
  
      # Cast Blog
      url(r'^blogs/', include('cast.urls', namespace='cast')),
  
      # rest
      url(r'^api/api-token-auth/', authtokenviews.obtain_auth_token),
      # url(r'api/', include('homepage.blogs.api.urls', namespace='api')),
      url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
      url(r'^docs/', include_docs_urls(title='My Blog API service')),
  
      # robots.txt
      url(r'^robots.txt',
          lambda x: HttpResponse("User-Agent: *\nDisallow: /*claas", content_type="text/plain"),
          name="robots_file"),
  
  ] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
  
  if settings.DEBUG:
      # This allows the error pages to be debugged during development, just visit
      # these url in browser to see how these error pages look like.
      urlpatterns += [
          url(r'^400/$', default_views.bad_request, kwargs={'exception': Exception('Bad Request!')}),
          url(r'^403/$', default_views.permission_denied, kwargs={'exception': Exception('Permission Denied')}),
          url(r'^404/$', default_views.page_not_found, kwargs={'exception': Exception('Page not Found')}),
          url(r'^500/$', default_views.server_error),
      ]
      if 'debug_toolbar' in settings.INSTALLED_APPS:
          import debug_toolbar
          urlpatterns = [
              url(r'^__debug__/', include(debug_toolbar.urls)),
          ] + urlpatterns
  
subject: use cast for /blogs/ url