Event-loop blocked when using http component starting from knative

[nicolaferraro]

I've the following route:

    from("knative:event/market.btc.usdt")
        .removeHeaders("Camel*")
        .to("http://quarkus-ml.{{env:NAMESPACE}}.svc.cluster.local/samples")
        .setBody().constant("");

If the target http service is down (e.g. scaled down by knative), it takes some seconds to have it running again, so the http call waits but blocks the event-loop:

Jul 08, 2020 1:56:53 PM io.vertx.core.impl.BlockedThreadChecker
WARNING: Thread Thread[vert.x-eventloop-thread-0,5,main]=Thread[vert.x-eventloop-thread-0,5,main] has been blocked for 2781 ms, time limit is 2000 ms