B4J Question HttpJob and Cookies

Sub Class_Globals
    Private hc As OkHttpClient

Public Sub Initialize(login As String, password As String, callback As Object)
    mCallBack = callback
    account.Initialize
    username = login
    haslo = password
    If hc.IsInitialized = False Then
        hc.Initialize("hc")
    End If
    Dim req As OkHttpRequest
    req.InitializePost2(url&"login", $"login=${login}&password=${password}"$.GetBytes("UTF8"))
    hc.Execute(req, 1)
    folder = File.DirInternal
End Sub

private Sub hc_ResponseSuccess (Response As OkHttpResponse, TaskId As Int)
    #if debug
    Log("TaskID-"&TaskId)
    #end if
'    File.WriteString(File.DirApp , "login.html",Response.ContentEncoding)
    If TaskId = 1 Then
        Response.GetAsynchronously("koniec", File.OpenOutput(folder, "login.html", False),True,TaskId)
        #if debug
        Log("Coocie OK")
        #end if
'        Response.Release
    End If
End Sub

private Sub koniec_StreamFinish (Success As Boolean, TaskId As Int)
    #if debug
    Log(Success &"  "&TaskId)
    #end if
    If TaskId = 1 Then
        GetAccount
    End If
End Sub

Dim client As HttpJob
    
client.Initialize("",Me)
client.Download("https://....")
    
Wait For (client) JobDone (res As HttpJob)
If res.Success=False Then
        Log("error")
        Return
End If
Dim CookieContainer As String = res.Response.GetHeaders.Get("Cookie")