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鉴于此，HTTP的核心问题之一就是，HTTP的认证机制会假定一个由请求处理器验证的单一身份(一个用户或一台服务器)。
With that in mind, one of the core problems of HTTP is that its authentication mechanisms assumes a single identity (the one of the user, or a server) validated by the request handler.
通过使用核心 Security 类，生成认证密钥并将其写入会话。
Using the core Security class, an authentication key is generated and written to the session.
虽然在这里我不会在JAAS的“认证”方面花很多时间(有关这个主题的更多参考请参阅参考资料)，但是我将重点介绍它的一个核心组件：subject类。
While I won't spend much time on the "Authentication" part of JAAS here (see Resources for further references on the topic), I will be focusing on one of its core components: the Subject class.
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