placing dots with contoller via URL like http://myweb.com/....controller..../index

My site is running on window server and I have created a controller with name Product and accessing this via URL example.com/.....product...../ by placing single or multiple dots before or after the controller name it still loading the product controller. e,g http://example.com/....................product............................/index
It should redirect to 404 page with a message "404 page not found" .. I am wondering why its loading product controller with multiple dots(.), It should redirect to 404 page not found.

Will appreciate if  some one help me to fix this issue in CodeIgniter 3.x