NodeJS S3 upload image from URL

gistfile1.js

// https://stackoverflow.com/a/25564742/1546710
var AWS = require('aws-sdk');
var request = require('request');

AWS.config.loadFromPath('./config.json');
var s3 = new AWS.S3();

function put_from_url(url, bucket, key, callback) {
    request({
        url: url,
        encoding: null
    }, function(err, res, body) {
        if (err)
            return callback(err, res);

        s3.upload({
            Bucket: bucket,
            Key: key,
            ContentType: res.headers['content-type'],
            ContentLength: res.headers['content-length'],
            Body: body // buffer
        }, callback);
    })
}

put_from_url('https://public.nftstatic.com/static/nft/res/f2a4326f37474c4eb216df45995fa4ee.png', 'buck37', 'uniqu3K3y', function(err, res) {
    if (err)
        throw err;

    console.log('Uploaded data successfully!');
});