Image-forming apparatus, terminal device, method for controlling image-forming apparatus, and method for controlling terminal device

A terminal device comprising:

• a controller;
• a storage;
• and
• a communicator, wherein
• the controller
• establishes a connection with the image-forming apparatus through the communicator using Quick UDP Internet Connections (QUIC),
• stores, in the storage, identification information for identifying the connection and key information to be used for encryption of transmission-reception information transmitted and received to and from the image-forming apparatus,
• performs communication of the transmission-reception information with the image-forming apparatus through Hypertext Transfer Protocol (HTTP)/3, and
• performs, when the connection with the image-forming apparatus is disconnected, a reconnection to the image-forming apparatus using the identification information so as to resume the communication of the transmission-reception information with the image-forming apparatus.

A method for controlling an image-forming apparatus, the method comprising:

• establishing a connection with a terminal device using Quick UDP Internet Connections (QUIC);
• storing identification information for identifying the connection and key information to be used for encryption of transmission-reception information transmitted and received to and from the terminal device;
• performing communication of the transmission-reception information with the terminal device through Hypertext Transfer Protocol (HTTP)/3;
• and
• establishing, when the connection with the terminal device is disconnected, a reconnection with the terminal device using the identification information, such that the communication of the transmission-reception information with the terminal device is resumed.

A method for controlling a terminal device, the method comprising:

• establishing a connection with an image-forming apparatus using Quick UDP Internet Connections (QUIC);
• storing identification information for identifying the connection and key information to be used for encryption of transmission-reception information transmitted and received to and from the image-forming apparatus;
• performing communication of the transmission-reception information with the image-forming apparatus through Hypertext Transfer Protocol (HTTP)/3;
• and
• performing, when the connection with the image-forming apparatus is disconnected, a reconnection to the image-forming apparatus using the identification information, such that the communication of the transmission-reception information with the image-forming apparatus is resumed.