s use functionality provided by legacy systems that reside outside the mesh. You may want
to migrate these systems to the service mesh gradually. Until these systems are migrated, they must be accessed by the
applications inside the mesh. In other cases, the applications use web services provided by third parties.</p><p>In this blog post, I modify the <a href=/v1.9/docs/examples/bookinfo/>Istio Bookinfo Sample Application</a> to fetch book details from
an external web service (<a href=https://developers.goo