<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services">

    <config xmlns="http://example.org/schema/dic/fos_http_cache">
        <cache-control>
            <rule>
                <match path="/abc"/>
                <headers last-modified="this is not a valid date"/>
            </rule>
        </cache-control>

    </config>
</container>
