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Overview of HTTP server push technologies and WebSocket protocol (Comet, Bayeux, Server Sent Events, Reverse HTTP). ...
Overview of HTTP server push technologies and WebSocket protocol (Comet, Bayeux, Server Sent Events, Reverse HTTP).
Pusing information asynchronously from web server to web client (browser) has always been a problem. The HTTP protocol is designed as a synchronous request-response protocol that requires the client to send a request to the server. Over time, various mechanism like long polling and XHTML-request evolved that provide asynchronous server pushs. However, most of these mechanisms are workarounds and browser-dependent.
The long-overdue update of the HTML protocol (HTML5) brought new mechanisms for truly asynchronous and browser-independent server pushs. Server Sent Events and WebSockets allow the client to open a channel that the server uses to send asynchronous messages to the client.