openssl官网：https://www.openssl.org/

windows版本：http://slproweb.com/products/Win32OpenSSL.html

mkcert：https://github.com/FiloSottile/mkcert

生成本地自签名证书步骤：

https://www.pudn.com/news/6228cb2c9ddf223e1ad0d609.html

https://blog.dteam.top/posts/2019-04/本地https快速解决方案mkcert.html

https://www.cnblogs.com/fallTakeMan/p/15637927.html

在线证书格式转换工具：

https://www.chinassl.net/ssltools/convert-ssl.html

https://csr.chinassl.net/generator-csr.html

https://www.tooleyes.com/tag/pem/

nginx配置文件生成工具：

https://www.digitalocean.com/community/tools/nginx?global.app.lang=zhCN

https://github.com/digitalocean/nginxconfig.io

https://www.nginxwebui.cn/