http server doesnt listen on 80 port

Hi,

Please help me with this trouble, i tried to start an http server on a ESP8266 (Nodemcu v3) with this code:

function handlePOST(req, callback) {
    var data = "";
    req.on('data', function(d) { data += d; });
    req.on('end', function() {
      // All data received from the client, so handle the url encoded data we got
      // If we used 'close' then the HTTP request would have been closed and we
      // would be unable to send the result page.
      let postData = {};
      data.split("&").forEach(function(el) {
        var els = el.split("=");
        postData[els[0]] = decodeURIComponent(els[1]);
      });
      // finally our data is in postData
      console.log(postData);
      // do stuff with it!
      console.log("We got the text on codeJS", postData.codeJS);
      // call our callback (to send the HTML result)
      callback(postData.codeJS);
    });
  }

function onRequest(req, res) {
    var rurl = url.parse(req.url,true);
    if (rurl.pathname=="/") {
      res.writeHead(200, {'Content-Type': 'text/html'});
      res.end(`<h1>Please send commands on HTTP POST at /cmd URL</h1>`);
    } else if (rurl.pathname=="/cmd" && req.method=="POST" && req.headers["Content-Type"]=="application/x-www-form-urlencoded") {        
        handlePOST(req, (codeJS) => {
            res.writeHead(200, {'Content-Type': 'text/plain'});
            let value = "";
            value = eval(codeJS);
            res.end(value);
        }); 
    } else {
        res.writeHead(404, {'Content-Type': 'text/html'});
        res.end("<h1>404: Page "+rurl.pathname+" not found</h1>");
    }
  }

function onInit() {
  carro.iniciarCarro();

  let wifi = require("Wifi");
  let httpServer = require("http");
  wifi.disconnect();
  wifi.setHostname("mycar");

  wifi.startAP("wifi-me", {password:"my-password",authMode:"wpa_wpa2"}, (error) => {
      if (error) throw error;
      console.log("Wifi  UP!, my IP is "+ wifi.getAPIP().ip);
      httpServer.createServer(onRequest).listen(80);
      wifi.save();
      save();    
  });
}

But its doesnt start the http server on port 80. When connect to telnet at port 23, and run httpServer.createServer(onRequest).listen(80); its works. What's happening with httpServer and why doesnt run at start?

Thanks a lot

Bunny