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<h4 class="subsection">4.1.1 Tuning validation behaviour</h4>
<p><a name="index-age-190"></a><a name="index-maxAge-191"></a><a name="index-maxAgeFraction-192"></a><a name="index-maxExpiresAge-193"></a><a name="index-maxNoModifiedAge-194"></a>
Polipo's revalidation behaviour is controlled by a number of
variables. In the following, an resource's <dfn>age</dfn> is the time since
it was last validated, either because it was fetched from the server
or because it was revalidated.
<p>The policy defining when cached instances become stale in the absence
of server-provided information is controlled by the variables
<code>maxAge</code>, <code>maxAgeFraction</code>, <code>maxExpiresAge</code> and
<code>maxNoModifiedAge</code>. If an instance has an ‘<samp><span class="samp">Expires</span></samp>’ header,
it becomes stale at the date given by that header, or when its age
becomes larger than <code>maxExpiresAge</code>, whichever happens first. If
an instance has no ‘<samp><span class="samp">Expires</span></samp>’ header but has a ‘<samp><span class="samp">LastModified</span></samp>’
header, it becomes stale when its age reaches either
<code>maxAgeFraction</code> of the time since it was last modified or else
the absolute value <code>maxAge</code>, whichever happens first. Finally,
if an instance has neither ‘<samp><span class="samp">Expires</span></samp>’ nor ‘<samp><span class="samp">Last-Modified</span></samp>’, it
will become stale when its age reaches <code>maxNoModifiedAge</code>.
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