Chapter 8. Persistent Communications Pattern


The Persistent Communications pattern provides a mechanism enabling the client and the server to communicate with each other on a persistent basis so that the client can send messages to the server, and the server can send messages to the client.


Client-server programming, which HTTP is, requires that the client call the server to process a request. The server obliges, processes the request, and sends a response. This is a standard run-of-the-mill operation.

Now imagine writing a web application that acts like a bulletin board. Each individual has the ability to create a message and post it. One extension would be offering the capability, when the messages are displayed, to indicate whether ...

Get Ajax Patterns and Best Practices now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.