What Is Server Push?

Slow loading, or incremental, documents are difficult to use in a traditional Web page because of the Web's page-at-a-time nature. Consider, for example, a page that runs a CGI program that takes a long, long time to run. First, the browser might time-out waiting for the CGI program to finish. Browsers typically wait about 90 seconds for results and then display a message saying that the site is unreachable.

Second, the CGI program can print a message occasionally stating, "I'm still working, 10% complete," and a few moments later, "I'm still working, 20% complete," and so on. Printing these messages is fine, except for the fact that the messages might not appear at regular intervals—because of buffering—and that when you're ...

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