old_contents: from django.conf.urls import url
  from rest_framework.urlpatterns import format_suffix_patterns
  
  from api import views
  
  urlpatterns = [
      url(r'^requests/$', views.FeedbackList.as_view()),
      url(r'^requests/(?P<service_request_id>\w+)/$', views.FeedbackDetail.as_view()),
      url(r'^services/$', views.ServiceList.as_view()),
  ]
  
  urlpatterns = format_suffix_patterns(urlpatterns)
  
new_contents: from django.conf.urls import url
  from rest_framework.urlpatterns import format_suffix_patterns
  
  from api import views
  
  urlpatterns = [
      url(r'^requests/$', views.FeedbackList.as_view(), name='feedback-list'),
      url(r'^requests/(?P<service_request_id>\w+)/$', views.FeedbackDetail.as_view(), name='feedback-details'),
      url(r'^services/$', views.ServiceList.as_view(), name='service-list'),
  ]
  
  urlpatterns = format_suffix_patterns(urlpatterns)
  
subject: fix urls names