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Next: <a href="Tweaking-validation.html#Tweaking-validation" accesskey="n" rel="next">Tweaking validation</a>, Previous: <a href="Cache-transparency.html#Cache-transparency" accesskey="p" rel="prev">Cache transparency</a>, Up: <a href="Cache-transparency.html#Cache-transparency" accesskey="u" rel="up">Cache transparency</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Variable-index.html#Variable-index" title="Index" rel="index">Index</a>]</p>
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<a name="Tuning-validation-behaviour"></a>
<h4 class="subsection">4.1.1 Tuning validation behaviour</h4>
<a name="index-age"></a>
<a name="index-maxAge"></a>
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<p>Polipo’s revalidation behaviour is controlled by a number of
variables. In the following, an resource’s <em>age</em> is the time since
it was last validated, either because it was fetched from the server
or because it was revalidated.
</p>
<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>Expires</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>Expires</samp>’ header but has a ‘<samp>LastModified</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>Expires</samp>’ nor ‘<samp>Last-Modified</samp>’, it
will become stale when its age reaches <code>maxNoModifiedAge</code>.
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