Push technology

Push, or server push, describes a style of Internet-based communication where the request for a given transaction is initiated by the publisher or central server.

It is contrasted with pull/get, where the request for the transmission of information is initiated by the receiver or client.

Description

Push services are often based on information preferences expressed in advance. This is called a publish/subscribe model. A client "subscribes" to various information "channels" provided by a server; whenever new content is available on one of those channels, the server pushes that information out to the client.

Push is sometimes emulated with a polling technique, particularly under circumstances where a real push is not possible, such as sites with security policies that require rejection of incoming HTTP/S requests.

See also

• BlazeDS
• BOSH
• Channel Definition Format
• Client–server model
• Comet
• File transfer
• GraniteDS
• Lightstreamer
• Pull technology
• Push Access Protocol
• Push e-mail
• SPDY
• SQL Server Notification Services
• Streaming media
• WebSocket

External links

• Push technology @ Wikipedia.org