Handles GET request

def GET(self):
        """ Handles GET request """
        if self.user_manager.session_logged_in() or not self.app.allow_registration:
            raise web.notfound()

        error = False
        reset = None
        msg = ""
        data = web.input()

        if "activate" in data:
            msg, error = self.activate_user(data)
        elif "reset" in data:
            msg, error, reset = self.get_reset_data(data)

        return self.template_helper.get_renderer().register(reset, msg, error)