免费SSL申请

https://letsencrypt.org/

https://letsencrypt.org/docs/client-options/

• ACMESharp (.NET, PowerShell)
• win-acme (.NET)
• Certify The Web GUI (.NET, WPF)
• oocx/acme.net (.NET)
• kelunik/acme-client (PHP)
• ZeroSSL Windows
• AutoACME (.NET)
• Posh-ACME (PowerShell)
• Certes (.NET)

选择ACMESharp

powershell 下的具体操作方式参考：

1.https://github.com/ebekker/ACMESharp/wiki/Quick-Start

2.https://pkisharp.github.io/ACMESharp-docs/Quick-Start