作为中介流中的一个步骤调用某个服务。

Invokes a service as a step in a mediation flow.

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引用对象的字段也可以作为中介处理程序参数公开。

Fields that reference objects can also be exposed as mediation handler parameters.

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为了使用它，必须有一台作为中介的连接到 Internet 的机器。

To use it, you'll need a machine on the Internet that you can use as an intermediary.

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