If routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); is mandatory, why isn't it setup once through IIS?

Question

I notice routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); is always setup whenever we create MVC applications.

If it is a mandatory thing, why don't we setup it once through IIS settings rather than doing it again and again ?

Answer 1

Nobody said it was 'mandatory'. It makes excellent sense to be there by default, though. And if you don't want it, you can remove it.