private Element servicesXml() {
        return parse(
                "<http>",
                "  <filtering>",
                "    <filter id='outer' />",
                "    <request-chain id='myChain'>",
                "      <filter id='inner' />",
                "    </request-chain>",
                "  </filtering>",
                "</http>");
    }
@author gjoranv
@author Tony Vaagenes
@since 5.1.26
config-model/src/test/java/com/yahoo/vespa/model/container/http/FilterChainsTest.java