Leverage security definitions for headers in example requests

test-app/app/controllers/application_controller.rb

@@ -1,7 +1,7 @@
 class ApplicationController < ActionController::Base
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.
-  protect_from_forgery with: :exception
+  protect_from_forgery with: :null_session
 
   wrap_parameters format: [ :json ]
 end