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I recently had to install a couple of squid servers to act as reverse proxies
for a webcluster. You can teach the squid server to stand in between in the
end users and the webservers, and to store all the static content ( .jpg .flv
.css .htm for example ) in the RAM. This saves a lot of I/O and bandwidth on
the webservers, and it can really speed up a site. At the end of the road
the webservers' load dropped by 92%. But before all this worked, I had to
run through a massive config file and since the squid config file is their
manual at the same time, it's about 5000 lines long. So I had to find out a
way to filter only the important settings from the config file.