C# HttpWebResponse WebClient 基础连接已经关闭: 发送时发生错误.

/sun49842566/article/details/82802297

net 4.0 设置： ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

//.net 4.5 设置： ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls1.2;

附上官方说明

/zh-cn/dotnet/api/.securityprotocoltype?view=netframework-4.7.2

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