| 摘要 |
The present invention provides a protocol for the transfer of files to and from electronic devices, especially wireless devices. In one embodiment, the present invention is used by these devices connected by any means to the source of the file. These means can be wireless, modem dial-up, or conduit of a PDA. Since the present invention is used by wireless devices which operate on limited and expensive wireless bandwidth, it is not verbose and "chatty" unlike prior art protocols based on clear-text HTML, XML, or HotSync. The present invention uses HTTP or HTTPS to connect two devices communicating with each other. HTTP is used since it is a protocol that is usually allowed to traverse virtual private network firewalls. The invention allows the server to maintain multiple sessions with different clients. These sessions will end automatically if no data is transferred after a certain length of time has elapsed. These different clients can connect and perform operations concurrently with each other. The present invention supports the following operations, viz.: Identify and Authenticate, List, Get, Replace, Add, Delete, Cancel, and Logout. The invention allows for synchronous transfer of messages to and from the wireless devices. The present invention, in one embodiment, lets the client initiate the transfer. The server does not automate the transfer unless a request is made by the client.
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