de>CUSTOM</code> action to enable the
external authorization on a proxy (either gateway or sidecar). The admin should verify the external auth service is up
and running.</p><p>At runtime,</p><ol><li><p>A request is intercepted by the proxy, and the proxy will send check requests to the external auth service, as
configured by the user in the authorization policy.</p></li><li><p>The external auth service will make the decision whether to allow it or not.</p></li><li><p>If allowed, the request will continue an