JavaScript can also replace some of the animation and page-reloading functionality of CGI. To perform animation and page-reloading, CGI provides mechanisms called “server push” and “client pull.”
With server push, the Web page server maintains a connection between the client and server. Server push restricts the number of simultaneous connections the Web page server can maintain-a popular page using server push will frequently reward potential visits with a “sorry, not now, try later” message. Client pull, on the other hand, involves the client frequently re-establishing its connection to the server, artificially adding to the traffic at the server.
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