<?xml version="1.0" encoding="UTF-8"?>
<test id="cache/header/control/revalidation/4" class="D" scope="cache:error504" testtype="application" type="manual" source="rfc2616#14.9.4" device="both">
  <assertion>When a cache is unable to revalidate a stale response containing a must-revalidate
directive, it generates a 504 (Gateway Timeout) warning and does not return the 
requested response. 
</assertion>
  <specnote>Untestable because it is not possible to portably simulate connection failure.
Please also see the Test Strategy note at the beginning of the section.</specnote>
  <method>
    <![CDATA[<card newcontext="true" id="main">
</card>]]>
  </method>
</test>

