There are two different types of pipes: data pipes and message pipes.
有两种不同类型的管道：数据管道和消息管道。
On the client side, the pipes are inverted -- in other words, the SOAP request message flows through the OutPipe and the response message flows through the InPipe.
在客户端，这两个管道是反向的——换句话说，SOAP 请求消息流经 OutPipe，而响应消息流经 InPipe。
One feature of handlers that is not present with pipes is the ability to target message headers at particular handlers through the use of SOAP roles and header tags.
处理器的一个特征就是它不会随管道一起出现，它可以通过使用SOAP角色和头标记来把目标消息头指定给专门的处理器来处理。
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