The position should be before 0 not after.

Author: bjonord

lib/request_queue_time/railtie.rb

@@ -1,7 +1,7 @@
 module RequestQueueTime
   class Railtie < Rails::Railtie
     initializer "RequestQueueTime.request_middleware" do |app|
-      app.middleware.insert_after 0, RequestQueueTime::Middleware
+      app.middleware.insert_before 0, RequestQueueTime::Middleware
     end
   end
 end