http resonse.write replaces \n with newline

I've stripped down my code, same error:

const WIFI = require("Wifi");

onPageRequest = function(req, res) {
  data = 'foo\nbar\\nfoo';
  res.writeHead(200, {"Content-Type": "text/text", "Content-Length": data.length});
  res.write(data);
  res.end();
};

startWifi = function() {
  WIFI.connect(ssid, {password: password}, function(err) {
    require("http").createServer(onPageRequest).listen(80);
    console.log(WIFI.getIP());
  });
};

ssid = "myssid";
password = "mypassword";
startWifi();

/*
What I get:
foo
bar\nbar

What I expected:
foo\nbar\\nfoo
*/