问node.js 服务器的响应次数是怎样的？

var http = require('http');

var service = http.createServer();

var count = 0;

service.on('request', function (req, res) {

    res.writeHead('200',{'Content-type': 'text/html;Charset=utf-8'});

    count++

    res.end(`欢迎第${count}次访问`);

}).listen(3000,function (err){

    if (!err)

        console.log("服务启动成功");

})