let net = require('net');

let server = net.createServer({

// 如果 pauseOnConnect 被设置为 true, 那么与连接相关的套接字都会暂停，也不会从套接字句柄读取数据。 这样就允许连接在进程之间传递，避免数据被最初的进程读取。 如果想从一个暂停的套接字开始读数据

pauseOnConnect: true

}, (socket) => {

socket.setEncoding('utf8');

socket.on('data', (data) => {

console.log(data);

});

socket.on('end', () => {

console.log('client disconnected');

});

//接收到客户端发送的错误就会调用

socket.on('error', (err) => {

console.log("error");

});

socket.on('close', () => {

console.log("close socket");

});

socket.end(`

HTTP/1.1 200 OK

Content-Type: text/plain

Content-Length: 5

hello`)

console.log('request');

});

server.listen(3000, () => {

console.log('opened server on', server.address({}));

});

server.on('connection', (socket) => {

console.log('connection');

});

//server.unref();//停止node对server的监听事件

//服务器关闭事件

server.on('close', (socket) => {

console.log('close server');

});

server.on('error', (e) => {

if (e.code === 'EADDRINUSE') {

console.log('Address in use, retrying...');

setTimeout(() => {

server.close();

server.listen(PORT, HOST);

}, 1000);

}

});