http.IncomingMessage 类

• 继承自: <stream.Readable>

IncomingMessage 对象由 http.Server 或 http.ClientRequest 创建，并分别作为第一个参数传给 'request' 和 'response' 事件。 它可用于访问响应状态、标头和数据。

不同于其 socket 的值是 <stream.Duplex> 的子类，IncomingMessage 本身继承了 <stream.Readable> 并被单独创建以解析和触发传入的 HTTP 标头和有效载荷，因为在保持活动的情况下底层套接字可能被多次重用。

• Extends: <stream.Readable>

An IncomingMessage object is created by http.Server or http.ClientRequest and passed as the first argument to the 'request' and 'response' event respectively. It may be used to access response status, headers, and data.

Different from its socket value which is a subclass of <stream.Duplex>, the IncomingMessage itself extends <stream.Readable> and is created separately to parse and emit the incoming HTTP headers and payload, as the underlying socket may be reused multiple times in case of keep-alive.