Printing apparatus to acquire print data and transmit a request to an external apparatus to close websocket communication when predetermined time period elapses

A management method for a websocket communication channel performed by a printing apparatus, the management method comprising:

• transmitting a handshake request message or a handshake response message to an external apparatus for establishing the websocket communication channel for communicating with the external apparatus;
• transmitting a print data request message for receiving print data for performing a printing operation to the external apparatus through the websocket communication channel;
• determining that a certain time has elapsed after the transmission of the print data request message without receiving the requested print data;
• and
• transmitting a closure request message to the external apparatus to close the websocket communication channel after the transmission of the print data request message is complete in response to the determining that the certain time has elapsed after the transmission of the print data request message without receiving the requested print data.

A printing apparatus connected with an external apparatus storing print data through the network, the printing apparatus comprising:

• a communication unit configured to perform data communication with the external apparatus;
• a printing unit configured to perform a printing operation;
• and
• a control unit configured to transmit a handshake request message or a handshake response message to the external apparatus for establishing a first websocket communication channel with the external apparatus by means of the communication unit,
• transmit a print data request message for receiving the print data to the external apparatus through the first websocket communication channel by means of the communication unit,
• acquire the print data from the external apparatus through the first duplex asynchronous communication channel in response to the request the print data by means of the communication unit,
• perform the printing operation on the basis of the acquired print data by means of the printing unit,
• determine whether a predetermined time period has elapsed since completion of acquisition of the print data;
• and
• transmit a closure request message to the external apparatus to close the websocket communication channel responsive to a determination that the predetermined time period has elapsed since the completion of acquisition of the print data and independent of performance of the printing operation when the print data is acquired,
• wherein the print data is written in a format processible by the printing apparatus without a format conversion procedure.