The underlying connection was closed: An unexpected error occurred on a receive
解决方法
webRequest.KeepAlive = false;
ServicePointManager.ServerCertificateValidationCallback += (s, cert, chain, sslPolicyErrors) => true;
//WebRequest请求被中止: 未能创建 SSL/TLS 安全通道 在请求之前插入TLS安全协议：
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
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