Node.js——req、res对象

requset对象类型<http.IncomingMessage>，继承stream.Readable类

requset对象：

• req.headers

• req.rawHeaders

• req.httpVersion

• req.method

• req.url

response对象：

• res.setHeader()
• res.end()
• res.wtire()
• res.statusCode

• res.statusMessage

• res.writeHead()　　

 res.writeHead(404, 'Not Found', {
        'Content-Type': 'text/plain;charset=utf8'
 })