I have a simple GAE app that includes a login/logout link. This app is running on the dev server at the moment.

The base page handler gets the current user, and creates a login/logout url appropriately. It then puts this information into a _template_data dictionary, for convenience of subclasses.

class BasePage(webapp.RequestHandler):
    _user = users.get_current_user()
    _login_logout_link = None
    if _user:
        _login_logout_link = users.create_logout_url('/')
    else:
        _login_logout_link = users.create_login_url('/')

    _template_data = {}
    _template_data['login_logout_link'] = _login_logout_link
    _template_data['user'] = _user

    def render(self, templateName, templateData):
        path = os.path.join(os.path.dirname(__file__), 'Static/Templates/%s.html' % templateName)
        self.response.out.write(template.render(path, templateData)) 

Here is one such subclass:

class MainPage(BasePage):
    def get(self):
        self.render('start', self._template_data)

The login/logout link is displayed fine, and going to the correct devserver login/logout page. However, it seems to have no effect - the server still seems to think the user is logged out. What am I doing wrong here?