WebResponse有时会报timeout异常

[请叫我汪海]

本来是自己的主机，用的联通的百兆宽带，在服务器写的API供客户端每隔1分钟调用1次，但是经常出现timeout的情况，有时候又访问正常。
后来去阿里云买了服务器，timeout次数明显减少，不过依旧还是会报错，大概每100次有一次timeout，这个对项目来说十分致命。
想问下大家在开发的过程中遇到过这样的问题吗，谢谢。
代码如下：

        /// <summary>
        /// 模拟POST访问
        /// </summary>
        /// <param name="postUrl">模拟POST的URL</param>
        /// <param name="postDataStr">需要POST的数据</param>
        /// <returns>模拟访问的网页源代码</returns>
        public static string sendPost(string postUrl, string postDataStr)
        {
            System.Net.ServicePointManager.DefaultConnectionLimit = 100;
            System.Net.ServicePointManager.Expect100Continue = false;
            string retString = string.Empty;
            if (Global.noException)
            {
                //用来存放cookie
                CookieContainer cookie = null;
                HttpWebRequest request = null;
                Stream myRequestStream = null;
                HttpWebResponse response = null;
                Stream myResponseStream = null;
                StreamReader myStreamReader = null;
                try
                {
                    //转化
                    byte[] byteArray = Encoding.UTF8.GetBytes(postDataStr);
                    cookie = new CookieContainer();
                    //发送一个POST请求
                    request = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
                    request.CookieContainer = cookie;
                    request.Timeout = 3000;
                    request.Method = "POST";
                    request.ContentType = "application/x-www-form-urlencoded";
                    request.ContentLength = byteArray.Length;
                    myRequestStream = request.GetRequestStream();
                    myRequestStream.Write(byteArray, 0, byteArray.Length);
                    myRequestStream.Close();
                    //获取返回的内容
                    response = (HttpWebResponse)request.GetResponse();
                    response.Cookies = cookie.GetCookies(response.ResponseUri);
                    myResponseStream = response.GetResponseStream();
                    myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
                    retString = myStreamReader.ReadToEnd();
                }
                catch (Exception ex)
                {
                    Global.noException = false;
                    MessageBox.Show("发送POST失败！\n报错：" + ex.Message);
                    if (Login.IsConnectedInternet())
                    {
                        HtmlTool.SendGet(Global.downUrl);
                    }
                }
                finally
                {
                    if (myStreamReader != null)
                    {
                        myStreamReader.Close();
                    }
                    if (myResponseStream != null)
                    {
                        myResponseStream.Close();
                    }
                    if (response != null)
                    {
                        response.Close();
                    }
                }
            }
            return retString;
        }

[hard_learner]

ServicePointManager.ServerCertificateValidationCallback += (se, cert, chain, sslerror) => true; var response = (HttpWebResponse)request.GetResponse(); 添加上上面的代码试下

[肖无疾]

出错自动重试

[小路子的宝]

http://www.tuicool.com/articles/fYVbQ3