大容量ファイルのダウンロードを提供するサンプルコード

large_file.js

var fs = require('fs');
var http = require('http');
var util = require('util');
var file = './1G.file';
var stat =  fs.statSync(file);
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'octet-stream/binary',
                      'Content-Length': stat.size
                     });
  var rStream = fs.createReadStream(file);
  rStream.on('data', function(chunk) {
    rStream.pause();
    process.nextTick(function() {
      res.write(chunk);
    });
  });
  rStream.on('end', function() {
    res.end();
  });
  res.on('drain', function() {
    rStream.resume();
  });
}).listen(1337);
setInterval(function() {
  console.log(util.inspect(process.memoryUsage()));
}, 1000);