前提：charles ssl proxying setting 设置正确
1.尝试过 chls.pro/ssl 去下 crt 证书 下载完安装 提示没有可用证书
2.保存 cer 证书文件到手机 从 SD 卡安装证书 安装完仍不能查看 https 请求 SSLHandshake: Received fatal alert: certificate_unknown
Charles 官网说明 https://www.charlesproxy.com/documentation/using-charles/ssl-certificates/
As of Android N, you need to add configuration to your app in order to have it trust the SSL certificates generated by Charles SSL Proxying. This means that you can only use SSL Proxying with apps that you control.
In order to configure your app to trust Charles, you need to add a Network Security Configuration File to your app. This file can override the system default, enabling your app to trust user installed CA certificates (e.g. the Charles Root Certificate). You can specify that this only applies in debug builds of your application, so that production builds use the default trust profile.