请求部分代码：

if (!(url.Contains("http://") || url.Contains("https://")))
url = "http://" + url;

if (url.StartsWith("https", StringComparison.InvariantCultureIgnoreCase))
{
// ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
ServicePointManager.DefaultConnectionLimit = 9999;
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
}

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = method.Trim().ToLower();
request.Timeout = timeout;
request.AllowAutoRedirect = true;
request.ContentType = EnumDescription.GetRemark(contenttype); //"text/html"; 
request.Accept = string.IsNullOrWhiteSpace(Accept) ? "text/html,application/xhtml+xml,*/*,zh-CN" : Accept;
request.UserAgent ="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36";
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore);
request.KeepAlive = true;
request.ServicePoint.Expect100Continue = false;
request.ProtocolVersion = HttpVersion.Version10;

异常情况：分页去请求其他接口可能前面几次是成功的，后面就出现这个错误，但也不是全部都会这样，感觉和数据量是不是有啥关系， 而且他会一直等一两分钟他才会报这个错误，我超时时间已经设置成60秒还是如此，这个和服务器，路由啥的有没有什么关系，因为原来没有过这个问题，近期才出现，我本地调试也都没这个问题

网上说直接用：ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

一直提示：The request was aborted: Could not create SSL/TLS secure channel. 

错误异常：

Received an unexpected EOF or 0 bytes from the transport stream.      at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.IO.StreamReader.ReadBuffer()
   at System.IO.StreamReader.ReadToEnd()