e> header added
to the request by the <code>productpage</code> service.</p><p>Note that Kubernetes services, like the Bookinfo ones used in this task, must
adhere to certain restrictions to take advantage of Istio&rsquo;s L7 routing features.
Refer to the <a href=/v1.5/docs/ops/deployment/requirements/>Requirements for Pods and Services</a> for details.</p><p>In the <a href=/v1.5/docs/tasks/traffic-management/traffic-shifting>traffic shifting</a> task, you
will follow the same basic pattern you learned here