请求被中止: 未能创建 SSL/TLS 安全通道，以及解决方法。

请求前加上
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
就可以了
例如

        private string LoadURLString(string url, Encoding ed, string GetPost)
        {
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create(url);
            request1.Method = GetPost;
            request1.ContentType = "application/json";
            request1.Accept = "application/json";
            return new StreamReader(((HttpWebResponse)request1.GetResponse()).GetResponseStream(), ed).ReadToEnd();
        }

作者：IBM_LELE
链接：https://www.jianshu.com/p/6ac55c3709d6
来源：简书
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