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The Apache/Perl integration project brings together the
full power of the Perl programming language and the Apache
HTTP server.
With mod_perl, it is possible to write Apache modules
entirely in Perl, which lets you easily do things that are
more difficult or impossible in regular CGI programs, such
as running sub requests. In addition, the persistent
interpreter embedded in the server saves the overhead of
starting an external perl interpreter, the penalty of Perl
start-up time. A not-least-important feature is code
caching, the modules and scripts are being loaded and
compiled only once, then for the rest of the
server's life the scripts are being served from the cache.
Thus the server spends its time only to run the
already-loaded and compiled code, which is very fast.
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