C#实现的访盗链的FileHandler

/// <summary>  /// 访盗链的FileHandler  /// </summary>  public class FileHandler:IHttpHandler  {  public FileHandler()  {  //  // TODO: 在此处添加构造函数逻辑  //  }       public void ProcessRequest(HttpContext context)    {    if ((context.Request.UrlReferrer == null) || (context.Request.UrlReferrer.Host == "localhost" && context.Request.UrlReferrer.Port == 16490))    {    context.Response.Expires = 0;    context.Response.Clear();    context.Response.ContentType = "rar";    context.Response.WriteFile(context.Request.PhysicalPath);    context.Response.End();    }    else //如果不是本地引用，则属于盗链引用，    {       HttpResponse response = context.Response;    response.Redirect(context.Request.ApplicationPath + "/ErrorPage.htm");    }       }    public bool IsReusable    {    get    {    return false;    }    }  }