http1.1.js

const http = require('http');
const keepAliveAgent = new http.Agent({
    keepAlive: true,
    // 多久發一次 tcp keep-alive 檢查
    keepAliveMsecs: 4000
});
const options = {
    hostname: 'localhost',
    port: 3000,
    path: '/',
    method: 'GET',
    headers: {
        'Connection': 'keep-alive'
    },
    agent: keepAliveAgent,
};

let req = http.request(options, (res) => {
    res.setEncoding('utf8');
    res.on('data', (chunk) => {
        console.log(`BODY: ${chunk}`);
    });
    res.on('end', () => {

        console.log("end");
        setTimeout(() => {
            req = http.request(options, (res) => {
                res.setEncoding('utf8');
                res.on('data', (chunk) => {
                    console.log(`BODY: ${chunk}`);
                });
                res.on('end', () => {
                    console.log('No more data in response.');
                });
            });

            req.end();
        }, 6000);
    });
});

req.on('error', (e) => {
    console.error(`problem with request: ${e.message}`);
});

// write data to request body
req.end();