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我已经根据 CFNetwork 编程指南实现了基于 CFStream 的连接。如何获取经过身份验证的代理服务器的凭据?有没有一种方法可以让我获得系统对话框存储的共享用户名和密码,当在同一网络中使用 NSURLConnection 时会提示该对话框。