同样地，您在控制器中为应用程序添加的目的地和其他控制代码；您不在您的模型中放入这些数据。
Likewise, the controller is where you add destinations and other controlling code for your application; you don't put any of that stuff in your model.
这种代理代码非常灵活，因为如果应用得当，它可以从 HTTP 头确定实际的目的地。
This proxy code is very flexible because, if used correctly, it can determine the actual destination from the HTTP headers.
中介代码在遍历目的地时对消息产生影响。
Mediation code operates on a message as it traverses that destination.
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