try testing

api/urls.py

@@ -0,0 +1,10 @@
+from django.urls import path
+from rest_framework.urlpatterns import format_suffix_patterns
+from . import views
+
+urlpatterns = [
+    path('snippets/', views.SnippetList.as_view()),
+    path('snippets/<int:pk>/', views.SnippetDetail.as_view()),
+]
+
+urlpatterns = format_suffix_patterns(urlpatterns)