Building on the previous answer and its feedback, I've followed a portion of this example application and I've successfully obtained the Ingress logs for HTTP requests with the following:

ingress_pod=$(kubectl get pods --namespace istio-system -l istio=ingress -o=jsonpath="{.items[0].metadata.name}")
kubectl logs $ingress_pod --namespace istio-system | grep -e '\] "GET'

You can also obtain the "East/West" HTTP traffic by obtaining the logs of the Envoy Sidecar with:

kubectl logs -l app=productpage,version=v1 --container=istio-proxy --namespace=default --tail 10000 | grep -e '\] "GET'

Feel free to modify the HTTP verbs in the grep commands's expressions along with the labels and namespaces accordingly.

You can get the logs of the istio-ingressgateway pod by running the following command:

$ kubectl -n istio-system logs $(kubectl -n istio-system get pods -listio=ingressgateway -o=jsonpath="{.items[0].metadata.name}") --tail=300

It shows what happens with last 300 incoming requests and possible errors.

More debugging commands can be found in this blog article. I hope it helps.