Http - troubles with cyrillic text

Hi everyone! When i trying send some cyrillic text via using

require("http").createServer

i getting very strange results.

Here is my code:

var wifi = require("Wifi");

wifi.connect('ssid', { password: 'pass'},function(s) {
  console.log(s);
  console.log(wifi.getIP());
});

function onPageRequest(req, res) {
  var a = url.parse(req.url, true);
  if (a.pathname=="/") {
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.end('Hello World! Привет Мир!');
  }
}
require("http").createServer(onPageRequest).listen(80);

And that's what i getting in my browser:

"Hello World! AFD0C8C2C5D2 ACC8D0!"

Can someone explain me, what i'm doing wrong? Thanks!