def start_session(self, desired_capabilities, browser_profile=None): if self.preserved_session_id: self.command_executor._commands['getSession'] = ('GET', '/session/$sessionId') self.session_id = self.preserved_session_id response = self.execute('getSession', {'sessionId ': self.session_id}) self.session_id = response['sessionId'] self.capabilities = response['value'] else: WebDriver.start_session(self, desired_capabilities, browser_profile)