n is still provided, despite the failure in the <em>details</em> microservice. You
have <strong>graceful service degradation</strong>: as you can see, the reviews and the ratings are displayed correctly, and the
application is still useful.</p><p>So what might have gone wrong? Ah&mldr; The answer is that I forgot to tell you to enable traffic from inside the mesh to
an external service, in this case to the Google Books web service. By default, the Istio sidecar proxies
(<a href=https://www.envoyproxy.io>Env