gistfile1.txt

'use strict';

const buff = new Uint8Array(16384);
const encode = new TextEncoder().encode;

function sendRequest (conn) {
    console.log("sending request");
    conn.write(encode('GET / HTTP/1.1\nHost: example.com\n\n')).then(() => console.log("request sent"));
}


let i = 0;
let to;

function doStep (conn) {
    switch (i) {
        case 0: {
            console.log('Sending req #1 (normal)');
            sendRequest(conn);
        } break;
        case 1: {
            console.log('Sending req #2 (Immediate promise resolution)');
            new Promise(r => r()).then(() => {
                console.log('Resolved! (sending) #2');
                sendRequest(conn);
            });
        } break;
        case 2: {
            console.log('Sending req #3 (Delayed promise resolution)');
            new Promise(r => setTimeout(r, 100)).then(() => {
                console.log('Resolved! (sending) #3');
                sendRequest(conn);
            });
        } break;
        case 3: {
            console.log('All responses recieved correctly, exiting.');
            Deno.exit();
        } break;
    }
    clearTimeout(to);
    to = setTimeout(() => {
        console.log('No response after 8 seconds, exiting.');
        Deno.exit();
    }, 8e3);
    i++;
}

Deno.dialTLS({hostname: 'example.com', port: 443 }).then(conn => {
    const dataLoop = () => {
        console.log("reading");
        conn.read(buff)
        .then(() => {
            console.log('Response!', new TextDecoder().decode(buff).slice(0, 100));
            doStep(conn);
        })
        .catch(error => {
            throw error;
        })
        .finally(dataLoop);
    };

    dataLoop();

    doStep(conn);
});