XMLHttpRequest和jQuery AJAX方法之间的响应头差异

Dears my problem is not duplicate.

code:

var data = {'userId': window.cookie.get('userId'),
    'sessionId': window.cookie.get('sessionId')}

$.post(window.DbUrl + '/test', data, function (e) {
    console.log(e);
});

I try to send ajax with jquery post and response is:

Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:Origin, Content-Type, X-Auth-Token, Authorization
Access-Control-Allow-Methods:GET, POST, PATCH, PUT, DELETE, OPTIONS
Access-Control-Allow-Origin:https://localhost:8080
Connection:keep-alive
Content-Length:1011
... 

code:

var formdata = new FormData();
formdata.append('sessionId', window.cookie.get('sessionId'));
formdata.append('userId', window.cookie.get('userId'));
var ajax = new XMLHttpRequest();
ajax.upload.addEventListener("progress", selff.myProgressHandler, false);
ajax.addEventListener("load", myCompleteHandler, false);
ajax.addEventListener("error", myErrorHandler, false);
ajax.addEventListener("abort", myAbortHandler, false);
ajax.open("POST", window.DbUrl + '/test',true);
ajax.send(formdata);

I try with XMLHttpRequest in same URL response is:

Allow:POST
Connection:keep-alive
Content-Length:4
Content-Type:text/html; charset=utf-8

In the nodejs express server, missing Access-Control-Allow-* headers.

But when ajax with XMLHttpRequest to php server every thing is Ok.

nodejs server:

app.post('/test', function (req, res) {
    res.setHeader('Access-Control-Allow-Origin', 'https://localhost:8080');
    res.setHeader('Access-Control-Allow-Credentials', 'true');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PATCH, PUT, DELETE, OPTIONS');
    res.setHeader('Access-Control-Allow-Headers', 'Origin, Content-Type, X-Auth-Token, Authorization');
    res.end('welcome');
});

php server is ok:

<?php
header('Access-Control-Allow-Origin: https://localhost:8080');
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Allow-Methods: GET, POST, PATCH, PUT, DELETE, OPTIONS');
header('Access-Control-Allow-Headers: Origin, Content-Type, X-Auth-Token, Authorization');

?>wellcome

What is the problem? why php server is ok both nodojs is not, why jquery ok in any server?