HTTP绑定具有自己的处理程序链和自己的一组消息上下文属性。

The HTTP binding has its own handler chain and its own set of message context properties.

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就是说在过滤器链处理过程中，对安全上下文的任何更改现在都保存在会话对象中。

This means that any changes made to the security context during filter chain processing now reside in the session object.

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SIF创建安全上下文并调用过滤器链中的其他过滤器。

SIF creates the security context and calls other filters in the filter chain.

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