outgoingMessage.pipe()

覆盖旧版 Stream 的管道方法，其是 http.outgoingMessage 的父类。

由于 OutgoingMessage 应该是只写流，因此调用此函数将抛出 Error。 因此，它禁用了从 Stream 继承的管道方法。

用户不应直接调用此函数。

Overrides the pipe method of legacy Stream which is the parent class of http.outgoingMessage.

Since OutgoingMessage should be a write-only stream, call this function will throw an Error. Thus, it disabled the pipe method it inherits from Stream.

The User should not call this function directly.