Global.asax实现屏蔽ip和图片防盗链

  protected void Application_BeginRequest(object sender, EventArgs e)
        {
            //屏蔽ip
            //if (HttpContext.Current.Request.UserHostAddress == "127.0.0.1")
            //{
            //    HttpContext.Current.Response.Write("你已被屏蔽");
            //    HttpContext.Current.Response.End();
            //}
            //图片防盗链，只要是图片请求，并且请求地址不是本服务器都将图片换位下面的盗链图片
            if (HttpContext.Current.Request.Url.AbsolutePath.EndsWith(".jpg") && HttpContext.Current.Request.UrlReferrer.Host != "localhost:2535")
            {
                HttpContext.Current.Response.WriteFile(HttpContext.Current.Server.MapPath("~/imgs/%D7%EE%D6%D5%BB%C3%CF%EB%A2%F7-%CA%A5%CD%AF%BD%B5%C1%D920080427084745.jpg"));
            }
        }