Relay apparatus, image processing apparatus and communication system

摘要

A relay apparatus includes a processor and a network interface for performing communication with an image processing apparatus and a server apparatus through a network. The processor functions as: a server-request-information receiving unit for receiving server request information transmitted to the relay apparatus by the server apparatus; an establishment request information receiving unit for receiving establishment request information transmitted by the image processing apparatus for requesting establishment of a session between the relay apparatus and the image processing apparatus according to a session establishment type first protocol for enabling server-push for transmitting the server request information to the image processing apparatus; and a server-request-information transmitting unit for transmitting the server request information received by the server-request-information receiving unit to the image processing apparatus by using the session established between the relay apparatus and the image processing apparatus.