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<h4 class="subsection">1.7.1 Harvest and Squid</h4>
<p><a name="index-Harvest-24"></a><a name="index-Squid-25"></a>
Harvest, the grandfather of all web caches, has since evolved into
<a href="http://www.squid-cache.org/">Squid</a>.
<p>Squid sports an elegant single-threaded non-blocking architecture and
multiplexes multiple clients in a single process. It also features
almost complete support for HTTP/1.1, although for some reason it
doesn't currently advertise it.
<p>Squid is designed as a large-scale shared proxy running on a dedicated
machine, and therefore carries certain design decisions which make it
difficult to use as a personal proxy. Because Squid keeps all
resource meta-data in memory, it requires a fair amount of RAM in
order to manipulate a reasonably sized cache.
<p>Squid doesn't cache partial instances, and has trouble with instances
larger than available memory<a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a>. If a client connection
is interrupted, Squid has to decide whether to continue fetching the
resource (and possibly waste bandwidth) or discard what it already has
(and possibly waste bandwidth).
<p>Some versions of squid would, under some circumstances, pipeline up to
two outgoing requests on a single connection. At the time of writing,
this feature appears to have been disabled in the latest version.
<p>Squid's developers have decided to re-write it in C++.
<div class="footnote">
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<h4>Fußnoten</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> Recent versions of Squid support
instances larger than available memory by using a hack that the
authors call a “sliding window algorithm”.</p>
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