CODEWITHSUNDEEP
communicationclient-server
Seth Carnegie
Seth Carnegie

Reputation: 75130

Server initiated communication

Whenever you request a web page, you send a message to a server, and the server responds. As far as I know, most interaction occurs this way: the client says one thing to the server, and the server says one thing back. The server can't "speak until spoken to".

Are there any technologies that let the server initiate a conversation? For instance, if you had a page that you wanted to always keep up to date, the way I'd do it now is periodically make an AJAX request to get updated info from the server. However, it would be nicer if the server could just let the client know at the moment when new info was available. Is there anything around that can do this?

Upvotes: 3

Views: 2744

Answers (2)

filipe
filipe

Reputation: 1691

The concept you are looking for is push technology.

Upvotes: 2

Adrian
Adrian

Reputation: 46452

All HTTP interactions are client request, server response. To get away from polling for updates as you described, you would have to look outside of HTTP; to do this in a webpage, you would have to use a plugin, Java applet, ActiveX control, etc.

Upvotes: 0

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