i><li><p>Create an instance for the handler with the <code>user</code> request header as a lookup key:</p><pre><code class=language-yaml data-expandlinks=true>$ kubectl apply -f - &lt;&lt;EOF
apiVersion: config.istio.io/v1alpha2
kind: instance
metadata:
  name: keyval
  namespace: istio-system
spec:
  template: keyval
  params:
    key: request.headers[&#34;user&#34;] | &#34;&#34;
EOF
</code></pre></li></ol><h2 id=request-header-operations>Request header operations</h2><ol><li><p>Ensure the <em>httpbin</em>