ASP.NET MVC Catch All

The ignore route is defined like this:

routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
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Why not

routes.IgnoreRoute("{resource}.axd/{*}");

What is the significance of pathInfo?

Thanks.

Exception will be thrown, route parameter must have name. The meaning of the * sign is explained here File path as MVC route argument

That's just to give the route parameter a name or an exception will be thrown. You could have called it {*foo}.