检测为第一次安装使用时charles会提供部分浏览器和应用的自动代理设置:
Windows / Internet Explorer proxy settings – used automatically by mostWindows applications
Mac OS X proxy settings – used automatically by most Mac OS Xapplications
Mozilla Firefox proxy settings (all platforms)
Mozilla Firefox可在设置ADD-ONs处添加自动配置插件:https://addons.mozilla.org/en-US/firefox/addon/charles-proxy/