adapters>Output-producing adapters</a><li role=none aria-label="Request header operations"><a href=#request-header-operations>Request header operations</a><li role=none aria-label=Cleanup><a href=#cleanup>Cleanup</a><li role=none aria-label="See also"><a href=#see-also>See also</a></li></ol><hr></div></nav><p>This task demonstrates how to use a policy adapter to manipulate request headers and routing.</p><h2 id=before-you-begin>Before you begin</h2><ul><li><p>Set up Istio on Kubernetes by following the inst