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The handling of conditional HTTP requests by gzip_cnc

The principles of operation of a browser cache

During the requests of HTTP ressources by a browser it is quite common that the same ressource should be reused within a short time interval.

Typical examples for this are

that are often stored in separate files and only referenced from several HTML pages using the HTML tags shown above. In this case the browser has to request these files via additional HTTP requests.

Of course this applies to the actual information units (the HTML pages) as well; der Effekt ist während einer einzelnen Browser-Sitzung allerdings nur dann relevant, wenn dieselbe Seite mehrfach besucht wird.

(Michael Schröpl, 2002-10-07)