nodejs -- 自定义头部信息

var http=require('http');http.createServer(function(req,res){    console.log(req.headers);    res.writeHead(200,{        'content-Type':'text/plain',        'aaaa':'wo'  //自定义头部信息    });    res.end("bbbbbbbbb");}).listen(8888,'127.0.0.1');console.log('server running at localhost:8888 ');