If ``request.session was modified``, or if the configuration is to save
        the session every time, save the changes and set a session cookie.

def process_response(self, request, response):
        """
        If ``request.session was modified``, or if the configuration is to save
        the session every time, save the changes and set a session cookie.
        """
        try:
            modified = request.session.modified
        except AttributeError:
            pass
        else:
            if modified or settings.SESSION_SAVE_EVERY_REQUEST:
                if request.session.get_expire_at_browser_close():
                    max_age = None
                    expires = None
                else:
                    max_age = request.session.get_expiry_age()
                    expires_time = time.time() + max_age
                    expires = cookie_date(expires_time)
                # Save the session data and refresh the client cookie.
                request.session.save()
                response.set_cookie(settings.SESSION_COOKIE_NAME,
                        request.session.session_key, max_age=max_age,
                        expires=expires, domain=settings.SESSION_COOKIE_DOMAIN,
                        path=settings.SESSION_COOKIE_PATH,
                        secure=settings.SESSION_COOKIE_SECURE or None)
        return response