'session, session attrs %s' % (username, cs))

        # dumps session attrs back to cookie

        session._update_cookie_out()

        # we set new cookie

        headers = None

        if session.request['set_cookie']:

            # send set-cookie headers back to response to update cookie

            headers = [('Set-Cookie', session.request['cookie_out'])]

        return headers

    def _validate_came_from(self, came_from):

        if not came_from:

        parsed = urlparse.urlparse(came_from)

        server_parsed = urlparse.urlparse(url.current())

        allowed_schemes = ['http', 'https']

        if parsed.scheme and parsed.scheme not in allowed_schemes:

            log.error('Suspicious URL scheme detected %s for url %s' %

                     (parsed.scheme, parsed))

            log.error('Suspicious NETLOC detected %s for url %s server url '

                      'is: %s' % (parsed.netloc, parsed, server_parsed))

    def _redirect_to_origin(self, origin, headers=None):

        '''redirect to the original page, preserving any get arguments given'''

        request.GET.pop('came_from', None)

        raise HTTPFound(location=url(origin, **request.GET), headers=headers)

    def index(self):

        not_default = self.authuser.username != User.DEFAULT_USER

        ip_allowed = self.authuser.ip_allowed

        # redirect if already logged in

        if self.authuser.is_authenticated and not_default and ip_allowed:

            return self._redirect_to_origin(c.came_from)

        if request.POST:

            # import Login Form validator class

            login_form = LoginForm()

            try: