Used correctly, ASP.NET routes simplify the URL patterns used to navigate to your site’s pages. But it’s all too easy for problems to creep into route implementations. Due to the way ASP.NET routes are implemented, you can't debug them with breakpoints or other standard problem-solving techniques. Learn how to use third-party tools such as Glimpse to debug broken routes, as well as how to write route-specific unit tests and show route-specific error pages.