Excel VBA browser automation GET/POST method

Question

I'm creating automation script for my work project to extract links after login.

I'm trying to login and get JSESSIONID, but unfortunately I always get JSESSIONID prior to login, therefore any next request just gets me links from login page.

When I login using browser manually, get JSESSIONID from cookies and add it to the script, then everything works as I want it to.

• Why do I always get JSESSIONID, which is probably prior login even if supplied correct login details for correct objects on the page?
• Website is super slow to load in browser do I need to set application wait before I get cookies?
• Is it possible that it doesn't submit the login details I supply if it is Javascript based submit?

Please see the example code I use below

Dim http As WinHttp.WinHttpRequest
Dim jsessionidCookie As String
Set http = New WinHttpRequest
http.Open "POST", "mywebpage/login/", False
http.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
http.setRequestHeader "Connection", "keep-alive"
http.send "userId=myusername&password=mypassword"
jsessionidCookie = http.getResponseHeader("Set-Cookie")
jsessionidCookie = Split(jsessionidCookie, ";")(0) ' the JSESSSIONID I get here is always wrong, it doesn't authorise me for any next requests
'Debug.Print jsessionIDCookie
If http.Status = 200 Then
    
    http.Open "GET", "mypage/page/2/", False
    http.setRequestHeader "Cookie", jsessionidCookie ' when I manually add JSESSIONID here which I manually extract from cookies in MS edge, everything works as intended
    http.send
    ' here goes script for extracting links, which I have no problems with
End If

I apologise I cannot provide any links to the webpage :( The webpage uses jQuery library and submit is being handled by JavaScript, if that helps with anything. Please see login.js module from the webpage:

$(document).ready(function() {
if ($("#userId").val() == "") {
    $("#userId").focus();
} else {
    $("#password").focus();
}
$("input").keypress(function(e) {

    switch (e.which) {

    case 13: // enter
        //$('[name="login"]').click();
        $("#login").submit();
        return false;
    default:
        break;

    }
});
});

• I tried using IE to extract cookies, because excel vba has really good controls over it, but it just returns empty string, as IE doesn't store files of cookies anymore and has no control over HTTPONLY cookies, I can get them through debug console/network, but that is a lot of script and IE often crashes on opening debug console
• I tried using SELENIUM, driver fails to start edge, I didn't try other browsers. Multiple reasons possible. And because this is work computer and is managed by company policies, I believe something is missing or is blocked by a policy. I wouldn't want to go that way
• I tried using EDGE in IE mode, yet eventually found out, it is temporary solution and it just didn't work for me
• I tried adapting code countless times, I just became desperate after weeks or trial and error.
• I tried copying the line "userId=myusername&password=mypassword" into address bar, which looks like this "mywebpage/login/?userId=myusername&password=mypassword" and it was entering values into correct inputs

My last case scenario is extracting JSESSIONID manually everytime I need automation to work, it's not a big deal for me I guess, but explaining it to people who will be working with the app, who think, that VLOOKUP is hacking software and to explain them how to get JSESSIONID from browser would be really hard

I tried what was written here here and here I couldn't understand if wireshark would assist in my situation and I couldn't really understand what to do with it. Besides the website with ignoring the encryption doesn't open