he <code>curl</code> command between <em>Istio services</em> (i.e those with sidecars), all
requests will fail with a 503 error code as the client side is still using plain-text.</p><pre><code class=language-bash data-expandlinks=true>$ for from in &#34;foo&#34; &#34;bar&#34;; do for to in &#34;foo&#34; &#34;bar&#34;; do kubectl exec $(kubectl get pod -l app=sleep -n ${from} -o jsonpath={.items..metadata.name}) -c sleep -n ${from} -- curl &#34;http://httpbin.${to}:8000/ip&#34; -s -o /dev/null -w &#34;sleep.