需要指定ssl证书
引用：using System.Net;
在请求之前插入TLS安全协议：System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
代码如下：
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(url);// 打开网络连接
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