check-jspm-io.js

var request = require('request');

console.log('Checking availability of https://jspm.io');

request({
    method: 'head',
    url: 'https://jspm.io',
    strictSSL: true,
    gzip: true,
    headers: {
        // 'User-Agent': 'Hyperlink v' + version + ' (https://www.npmjs.com/package/hyperlink)',
        // 'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.96 Safari/537.36',
        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
        'Accept-Encoding': 'gzip, deflate, sdch, br'
    }
}, function (err, res) {
    if (err) {
        throw err;
    }

    console.log('HEAD statusCode', res.statusCode);
    if (res.statusCode === 502) {
        console.log('retrying with GET');
        request({
            method: 'get',
            url: 'https://jspm.io',
            strictSSL: true,
            gzip: true,
            headers: {
                // 'User-Agent': 'Hyperlink v' + version + ' (https://www.npmjs.com/package/hyperlink)',
                // 'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.96 Safari/537.36',
                'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
                'Accept-Encoding': 'gzip, deflate, sdch, br'
            }
        }, function (err, res) {
            if (err) {
                throw err;
            }

            console.log('GET statusCode', res.statusCode);
        });
    }
});