记录一下postman 正常返回 c# 模拟https 请求出现The request was aborted: Could not create SSL/TLS secure channel.

在发送请求前加入如下代码：
//始终验证服务器证书
ServicePointManager.ServerCertificateValidationCallback =
(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) => { return true；}；
//设置协议
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3  |
                                      SecurityProtocolType.Tls12 |
                                      SecurityProtocolType.Tls11 |
                                      SecurityProtocolType.Tls；