public static ApplicationResponse Generate404Page(HttpRequest request， string bodyMessage， string pageHeader， string title = "Error Page")
        {
            //检查如果存在defaultPage
            if (!File.Exists(HttpApplicationManager.RootDirectory + "\\" + HttpApplicationManager.DefaultPage))
            {
                //没有数据发送回来，所以连接将关闭。
                return new ApplicationResponse(request) { Action = ResponseAction.Disconnect };
            }
            //获取文件
            byte[] page = Helper.GetFile(HttpApplicationManager.RootDirectory + "\\" + HttpApplicationManager.DefaultPage);
            string page_str = new String(Encoding.UTF8.GetChars(page));
            //与异常信息填写页面
            page_str = page_str.Replace("<%ws_title%>"， title);
            page_str = page_str.Replace("<%ws_domain%>"， HttpApplicationManager.CurrentDomain + ":" + HttpApplicationManager.ServicePort);
            page_str = page_str.Replace("<%ws_header%>"， pageHeader);
            page_str = page_str.Replace("<%ws_message%>"， bodyMessage);
            page = Encoding.UTF8.GetBytes(page_str);
            //获取pageHeader
            byte[] binheader = GetHeader(page.Length， MimeType.text_html， true， false);
            //构建响应
            byte[] completeResponse = binheader.Concat(page);
            ApplicationResponse response = new HttpResponse(completeResponse， request);
            return response;
        }

        /// <summary>
        /// 从资源提取源MimeType
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        public static MimeType GetResourceMime(string request)
        {
            if (string.IsNullOrEmpty(request)) return MimeType.none;
            string[] filepats = request.Split(new string[] { "." }， StringSplitOptions.RemoveEmptyEntries);
            if (filepats.Length > 0)
            { HTTP服务器软件系统的设计与实现(20):http://www.751com.cn/jisuanji/lunwen_3170.html