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回答

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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