Istio version is 1.4 and install in kubernetes which version is 1.15.
There are 1s delay for each request when we use http1.0 protocol.
We added "- name: ISTIO_META_HTTP10 value: ‘1’ " to enable http1.0 on Ingress level.
Please check log on Ingress
I think there are some happen during reporting attributes.
BTW,It’s work fine when we change the protocol to http1.1.
Looking forward to reply