NodeJs Stream

var http = require('http'), fileSystem = require('fs'), path = require('path'), util = require('util');

http.createServer(function(request, response){
    var filePath = path.join(__dirname, "stream", "video.mp4");
    var stat = fileSystem.statSync(filePath);
    // inicio do pedaço
    var inicio = 0;
    // Fim do pedaço
    var fim = 0;

    var range = request.headers.range;
    console.log(range);

    if (range) {
        console.log('Existe range');
        inicio  = parseInt(range.slice(range.indexOf("byte=")+6,range.indexOf("-")));
        fim     = parseInt(range.slice(range.indexOf("-")+1, range.length));
    }

    if (inicio > fim)
        return;

    if (isNaN(fim) || fim == 0) {
        fim = stat.size - 1;
    }
    response.write(206, {
        'Content-Type'  : 'video/mp4',
        'Content-Range' : 'bytes ' + inicio + '-' + fim + '/' + stat.size,
        'Content-Length': stat.size,
        'Transfer-Encoding':'chunked'
    });
    console.log(inicio);
    console.log(fim);

    var readStream = fileSystem.createReadStream(filePath, { flags: 'r', start: inicio, end: fim });

    util.pump(readStream, response);
}).listen(3000);