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public class Global : HttpApplication
{
	protected void Application_OnError()
	{
		if (Context.IsCustomErrorEnabled && isAjaxRequest())
		{
			// By default, customErrors will cause a 302 redirect
			// We really want a 500 response, so that the client request knows there was an error
			error_without_redirect();
		}
	}

	private void error_without_redirect()
	{
		Server.ClearError();
		Response.ClearContent();
		Response.StatusCode = 500;
		Response.StatusDescription = "Internal Server Error";
		Response.Write("<html><body><h1>500 Internal Server Error</h1></body></html>");
	}

	private static bool isAjaxRequest()
	{
		return HttpContext.Current.IsAjaxRequest();
	}
}