asp.net mvc - What is routes.IgnoreRoute("{resource}.axd/{*pathInfo}")

Question

What is routes.IgnoreRoute("{resource}.axd/{*pathInfo}")

I cannot find any .axd file in my project, can I remove this route rule?

Answer 1

.axd files don't exist physically. ASP.NET uses URLs with .axd extensions (ScriptResource.axd and WebResource.axd) internally, and they are handled by an HttpHandler.

Therefore, you should keep this rule, to prevent ASP.NET MVC from trying to handle the request instead of letting the dedicated HttpHandler do it.