old_contents: # -*- coding: utf-8 -*-
  from django.conf.urls import url
  from .views import *
  
  urlpatterns = [
      url(r'^device/$', device, name="device"),
      url(r'^verify/(?P<key>[a-f0-9]{32})$', verify, name="verify"),
      url(r'^subscribe/$', subscribe, name="subscribe"),
      url(r'^categories/$', categories, name="categories"),
  ]
  
new_contents: # -*- coding: utf-8 -*-
  from django.conf.urls import url
  from .views import *
  
  urlpatterns = [
      url(r'^device$', device, name="device"),
      url(r'^verify/(?P<key>[a-f0-9]{32})$', verify, name="verify"),
      url(r'^subscribe$', subscribe, name="subscribe"),
      url(r'^categories$', categories, name="categories"),
  ]
  
subject: remove slash from url