Then you deploy the
<a href=/v1.18/docs/examples/bookinfo/>Istio Bookinfo sample application</a>, <a href=/v1.18/docs/examples/bookinfo/#apply-default-destination-rules>apply the default destination rules</a>, and
<a href=/v1.18/docs/tasks/traffic-management/egress/egress-control/#change-to-the-blocking-by-default-policy>change Istio to the blocking-egress-by-default policy</a>.</p><p>This application uses the <code>ratings</code> microservice to fetch book ratings, a number between 1 and 5. The ratings are