当为 Web 服务环境选择和实现安全模型时，安全报头标记和受信任上下文都是要重点考虑的特性。

Security header tokens and trusted context are important features to consider when choosing and implementing the security model for your Web services environment.

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比较典型的情况是，这个处理器会检查每一个入站消息的重要元素(头标记、消息类型等待)，从而选择一个目标服务端点。

Typically, the handler examines important elements of each incoming message (headers, message type, and so on) and selects a target service endpoint accordingly.

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