Returns: See Also:When the server creates a session in response to the first request,
the session is in a new state. So, HttpSession.isNew() will return true.
On the next request, which must include the session ID received from the server (cookies or rewritten url)
the server will associate the request with the session.
The client will then have joined the session, meaning that the session is no longer
in the new state. So, HttpSession.isNew() will return false.,