与客户机不同，服务器可以通过头字段发送信息。
Not unlike the client, the server can send information through header fields.
在传真机和电子邮件发明以前，邮寄是发送信息的唯一途径。
Before the invent of fax machines and email, mail was the only way to send information.
它的目的是，在服务总线这样一个负责在服务和服务客户机之间传送信息的核心框架中引入一个拦截点。
The goal was to introduce an interception point within the service bus — the core framework component that was responsible for transporting messages between services and service clients.
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