Session management: application, session, request, pagecontext.

会话管理：application, session, request, pagecontext。

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The pageContext object is a repository for page-scoped variables and has methods for obtaining all the other implicit objects.

pageContext 对象是用于页面范围变量的存储库，它包含获取所有其他隐式对象的方法。

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Here, protocol information is retrieved from the request object (by means of the EL's pageContext implicit object) and tested using a simple string comparison.

在这里，检索请求对象而获得协议信息(通过EL的pagecontext隐式对象)，并用简单的字符串比较对协议信息进行测试。

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