Refactor Cache-Control and Vary definitions (#24347)

spec/controllers/settings/exports_controller_spec.rb

@@ -11,16 +11,16 @@ describe Settings::ExportsController do
 
       before do
         sign_in user, scope: :user
+        get :show
       end
 
-      it 'renders export' do
-        get :show
-
-        export = assigns(:export)
-        expect(export).to be_instance_of Export
-        expect(export.account).to eq user.account
+      it 'returns http success' do
         expect(response).to have_http_status(200)
       end
+
+      it 'returns private cache control headers' do
+        expect(response.headers['Cache-Control']).to include('private, no-store')
+      end
     end
 
     context 'when not signed in' do