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The returned code extract may be: Resource under test - invalid value "" This is most probably triggered by the fact that the Checker is not looking at the right place to return the position. Be more explicit that the value should probably be looked for in the meta element or in the HTTP headers. see for instance the report for: http://www.w3.org/2008/08/mok-check-tests/1.html
Incorrect value was not returned when the messages was triggered by a meta http-equiv element. I updated the message to also return the origin of the message. Message now returned is: [[ A cache related header or a meta http-equiv value ("Cache-Control" meta http-equiv) contains an invalid value (no-cache, foobar) ]]