namespace Microsoft.Web {
    public class ValidatePathModule : IHttpModule {
        public ValidatePathModule() {
        }
        void IHttpModule.Init(HttpApplication app) {
            app.BeginRequest += new EventHandler(this.OnBeginRequest);
        }
        void IHttpModule.Dispose() {
        }
        void OnBeginRequest(Object source, EventArgs eventArgs) {
            HttpRequest request = (source as HttpApplication).Request;
            string physicalPath = request.PhysicalPath;
            if (request.Path.IndexOf('\\') >=  0  || Path.GetFullPath(physicalPath) != physicalPath) {
                throw new HttpException( 404 , "Not Found");
            }
        }
    }
}