node keep-alive

keep-alive.js

const net = require('net');
const {parse} = require('url');

const [,,url] = process.argv;
const client = new net.Socket();
const {hostname, port = 80, path} = parse(url);

client.on('error', (e) => {throw e});

const request = (cb) => {
    console.log(`GET ${path} ...`);
    client.write(`GET ${path}\r\nConnection: keep-alive\r\n\r\n`);
    client.once('data', (data) => {
        const [status,] = data.toString().split('\n');
        console.log(status);
        cb();
    });
};

const requests = (delay, cb) =>
    request(() => setTimeout(() => request(cb), delay));

client.connect(port, hostname, (err) => {
    console.log(`Connected to ${hostname},${port}...`);
    if (err) {
        throw err;
    }
    requests(6000, () => {
        client.destroy();
    });
});