gistfile1.js

function sendSMS(cb){
    var sendSMSOptions = {
        hostname: 'api.ninja.is',
        path: '/my-SMS-web-hook',
        method: 'POST',
        headers: {accept: 'text/plain'}
    };

    req = http.request(sendSMSOptions, function(res){
        res.on('end', function () {
            cb();
        });

        res.on('error', function(err){
            cb(err);
        })
    })
    .on('error', function(e) {
        cb(e);
    });

    req.end();
}