B4J Question [abmaterial] cookie is null?

[liulifeng77]

hi,

Sub List1_Clicked(ItemId As String)
        ws.Session.SetAttribute("kc",ItemId)
        page.CookieSet("k",ItemId,"expires:'01/01/2019'")
    Log("cookie"&page.CookieGet("k"))
        end sub

cookie is null ，
something I missed?
thanks!