The built-in webserver is hardwired to use Default.aspx as the default page.
The project must have atleast an empty Default.aspx file to overcome the Directory Listing problem for Global.asax.
:)
Once you add that empty file all requests can be handled in one location.
public class Global : System.Web.HttpApplication
{
protected void Application_BeginRequest(object sender, EventArgs e)
{
this.Response.Write("hi@ " + this.Request.Path + "?" + this.Request.QueryString);
this.Response.StatusCode = 200;
this.Response.ContentType = "text/plain";
this.Response.End();
}
}