Check if domains is alive

is-domain-alive.js

const domains = [
    `sci-hub.ws`,
    `sci-hub.ac`,
    `sci-hub.biz`,
    `sci-hub.gq`,
    `sci-hub.ga`,
    `sci-hub.io`,
    `sci-hub.nu`,
    `sci-hub.name`,
    `sci-hub.is`,
    `sci-hub.mn`,
    `sci-hub.bz`,
    `sci-hub.org`,
    `sci-hub.tv`,
    `mg.scihub.ltd`,
    `sci-hub.nz`,
    `sci-hub.la`,
    `sci-hub.tw`,
    `scihub.wikicn.top`,
    `sci-hub.hk`,
    `sci-hub.ren`,
    `scihub.bban.top`,
    `sci-hub.cc`,
    `sci-hub.mksa.top`,
    `sci-hub.shop`
]

function ping(url) {
    function request_image(url) {
        return new Promise(function(resolve, reject) {
            const img = new Image();
            img.onload = function() { resolve(true) };
            img.onerror = function() { reject(false) };
            img.src = `https:\\${url}/favicon.ico`;
        });
    }

    return new Promise(function(resolve, reject) {
        const response = function(isAlive) {
            resolve( {url, isAlive}); 
        };
        request_image(url).then(response).catch(response);
        
        setTimeout(function() { reject(Error('Timeout')); }, 5000);
    });
}

const promises = domains.map((domain) => {
    return ping(domain).catch(error => error)
})

Promise.all(promises)
  .then(response => console.log(response))
  .catch(error => console.log(`Error in executing ${error}`))