Failing to download a file with request

gistfile1.js

var request = require('request');
var fs = require('fs');
var url = 'http://www.google.com/images/srpr/logo3w.png';
// for comparison, wget https://www.google.com/images/srpr/logo3w.png then diff logo3w.png nodeVersion.png
request({url: url}, function(error, response, body) {
  if (error) callback(error);
  else {
    fs.writeFile('./nodeVersion.png', body, 'base64', function(err){
            if(err) console.log(err);
            else console.log('yay')
    }); 
  }
});