of the
<a href=/v1.9/docs/reference/config/networking/envoy-filter/>low-level Envoy configuration APIs</a> in Istio, or may not be possible
at all.</p></li><li><p>Authorization policy lacks necessary semantics for your use case.</p></li></ul><h2 id=solution>Solution</h2><p>In Istio 1.9, we have implemented extensibility into authorization policy by introducing a <a href=/v1.9/docs/reference/config/security/authorization-policy/#AuthorizationPolicy-Action><code>CUSTOM</code> action</a>,
which allows you to d