 <code>/etc/hosts</code> and remove <code>-H</code> flag:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ echo &#34;$HOST httpbin.example.com&#34; &gt;&gt; /etc/hosts
$ curl -s -I &#34;http://httpbin.example.com:${PORT}/status/200&#34;
HTTP/1.1 200 OK
server: istio-envoy
...</code></pre><p>Access any other URL that has not been explicitly exposed. You should see an HTTP 404 error:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ curl -s -I -HHost:httpbin.ex