webrequest 访问https url代

最近有个应用需要发送http/https webrequest，调用php https接口时注意设置 ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; c#代码如下：

        /// <summary>        /// Send Json Http Request        /// </summary>        /// <param name="requestURI"></param>        /// <param name="json"></param>        /// <returns></returns>        public string SendHttpRequest(string requestURI, string json)        {            //json格式请求数据            string requestData =  "query="+json;            //URL            string serviceUrl = string.Format("{0}", requestURI);            System.Text.RegularExpressions.Regex _reg = new System.Text.RegularExpressions.Regex("^https://",                                                    System.Text.RegularExpressions.RegexOptions.IgnoreCase);            if (_reg.IsMatch(serviceUrl))            {                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;                ServicePointManager.ServerCertificateValidationCallback =                     new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);            }            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);            //utf-8编码            byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(requestData);            //post请求            myRequest.Method = "POST";            myRequest.ContentLength = buf.Length;            //指定为json否则会出错            //myRequest.ContentType = "application/json";            myRequest.ContentType = "application/x-www-form-urlencoded";            myRequest.MaximumAutomaticRedirections = 1;            myRequest.AllowAutoRedirect = true;            myRequest.KeepAlive = false;                        Stream newStream = myRequest.GetRequestStream();            newStream.Write(buf, 0, buf.Length);            newStream.Close();            //获得接口返回值，格式为： {"name":"value"}             HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);            string ReqResult = reader.ReadToEnd();             reader.Close();            myResponse.Close();            return ReqResult;          }        public bool CheckValidationResult(object sender,                                        System.Security.Cryptography.X509Certificates.X509Certificate certificate,                                        System.Security.Cryptography.X509Certificates.X509Chain chain,                                        System.Net.Security.SslPolicyErrors errors)        {            //直接确认，不然打不开            return true;        }        #endregion