var fs = require('fs');
var request = require('request');
var progress = require('request-progress');

// The options argument is optional so you can omit it
progress(request('http://google.com/doodle.png'), {
    throttle: 2000,                    // Throttle the progress event to 2000ms, defaults to 1000ms
    delay: 1000,                       // Only start to emit after 1000ms delay, defaults to 0ms
    lengthHeader: 'x-transfer-length'  // Length header to use, defaults to content-length
})
.on('progress', function (state) {
    // The state is an object that looks like this:
    // {
    //     percent: 0.5,              // Overall percent between 0 to 1
    //     speed: 554732,             // The download speed in bytes/sec
    //     size: {
    //         total: 90044871,       // The total payload size in bytes
    //         transferred: 27610959  // The transferred payload size in bytes
    //     },
    //     time: {
    //         elapsed: 36.2356,      // The total elapsed seconds since the start (3 decimals)
    //         remaining: 81.4032     // The remaining seconds to finish (3 decimals)
    //     }
    // }
    console.log('progress', state);
})
.on('error', function (err) {
    // Do something with err
})
.pipe(fs.createWriteStream('doodle.png'));