The route is setup as <a href=https://www.envoyproxy.io/docs/envoy/latest/api-v2/api/v2/route/route_components.proto#envoy-api-field-route-route-direct-response>direct response</a>
with <code>502</code> response code which means if no other routes match the Envoy proxy
will directly return a <code>502</code> HTTP status code.</p><ul><li><strong>PassthroughCluster</strong> - The PassthroughCluster is a virtual cluster created
in the Envoy configuration when <code>global.outboundTrafficPolicy.mode</code> is s