ly a rule to route traffic based on the value of an HTTP request header.</p><h2 id=apply-a-virtual-service>Apply a virtual service</h2><p>To route to one version only, you apply virtual services that set the default version for the microservices.
In this case, the virtual services will route all traffic to <code>v1</code> of each microservice.</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.5/img/icons.svg#callout-warning"/></svg></div><div class=content>I