10.13. Valid URL Characters

Previous versions of ASP.NET limit accepted URLs to a specific set of characters. The following characters were considered invalid in a URL: <, >, &. You can use the new requestPathInvalidChars property to specify invalid characters. The following example makes a, b, and c invalid in requests (which isn't too useful but demonstrates the feature):

<httpRuntime requestPathInvalidCharacters="a,b,c">