Abstract: A method including receiving a data request and performing device authentication based on the data request; sending a session parameter after the device authentication is successful, the session parameter comprising a session identifier and a communication key; establishing a persistent connection based on the session identifier; and receiving encrypted service data through the persistent connection, and parsing the encrypted service data based on the communication key. Data is transmitted without the need of reconnection, thereby effectively reducing resource consumption. Moreover, the data is parsed by using the communication key, thereby guaranteeing the data security.