/p><pre><code class=language-bash data-expandlinks=true>$ curl --request POST --header &#34;content-type:application/json&#34; --data &#39;{&#34;message&#34;:&#34;hello world&#34;}&#39; &#34;http://${EXTERNAL_IP}:80/echo?key=${ENDPOINTS_KEY}&#34;
</code></pre><p>To install Istio for GKE, follow our <a href=/v1.1/docs/setup/kubernetes/prepare/platform-setup/gke>Quick Start with Google Kubernetes Engine</a>.</p><h2 id=http-endpoints-service>HTTP Endpoints service</h2><ol><li><p>Inject the service into the mes