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<h3 class="section">3.5 Server statistics</h3>
<p><a name="index-serverExpireTime-110"></a><a name="index-server-statistics-111"></a><a name="index-round_002dtrip-time-112"></a><a name="index-transfer-rate-113"></a>
In order to decide when to pipeline requests (see <a href="Pipelining.html#Pipelining">Pipelining</a>) and
whether to perform Poor Man's Multiplexing
(see <a href="Poor-Mans-Multiplexing.html#Poor-Mans-Multiplexing">Poor Mans Multiplexing</a>), Polipo needs to keep statistics
about servers. These include the server's ability to handle
persistent connections, the server's ability to handle pipelined
requests, the round-trip time to the server, and the server's transfer
rate. The statistics are accessible from Polipo's web interface
(see <a href="Web-interface.html#Web-interface">Web interface</a>).
<p>The variable ‘<samp><span class="samp">serverExpireTime</span></samp>’ (default 1 day) specifies how
long such information remains valid. If a server has not been
accessed for a time interval of at least <code>serverExpireTime</code>,
information about it will be discarded.
<p>As Polipo will eventually recover from incorrect information about a
server, this value can be made fairly large. The reason why it exists
at all is to limit the amount of memory used up by information about
servers.
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