fic based on the value of an HTTP request header.</p><h2 id=route-to-version-1>Route to version 1</h2><p>To route to one version only, you configure route rules that send traffic to default versions for the microservices.</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.16/img/icons.svg#callout-warning"/></svg></div><div class=content>If you haven&rsquo;t already, follow the instructions in <a href=/v1.16/docs/examples/bookinfo/#define-the-service-versions>