IIS Issue - Ignoring default document

We were having some issues trying to get an Azure app to show the proper page by default when hitting the root domain.  We flailed around for a while and eventually someone found out that there is a known issue in Windows 7 Service Pack 1 that causes the Extensionless URL feature to interfere with the way ASP.NET parses URLs that would normally be handled by the Default Document setting.  This causes redirection to the Forms Authentication login page instead of the Default Document when the url is pointing to the root of the website.  The solution is to rewrite any requests made to the root of the website to a url that explicitly references the "defaultDocument".

Do this in the global.asx:

void Application_BeginRequest(object sender, EventArgs e)
{
    if (Request.AppRelativeCurrentExecutionFilePath == "~/")
    {
        // Get the defaultDocument filename from web.config.
        System.Xml.Linq.XDocument xDoc = 
            System.Xml.Linq.XDocument.Load(HttpContext.Current.Server.MapPath("~/Web.config"));

        string defaultDocumentName = 
            xDoc.Element("configuration")
            .Element("system.webServer")
            .Element("defaultDocument")
            .Element("files")
            .Element("add").Attribute("value").Value;

        // Rewrite the url.
        HttpContext.Current.RewritePath(defaultDocumentName);
    }
}

Hope this saves someone else some time.