Request timeouts

I have a strange case of a single request just timeouts while others work normally. Tried without istio and it works but somehow with istio it is an issue (other request to the same service using istio are ok). Nothing in logs and attaching “x-envoy-upstream-rq-timeout-ms:xxxx” and rising the timeout does not help

istio version: 1.1.3

@volatilemolotov What do you mean by single request? You mention that you have a service which is getting requests when using Istio and things are mostly working. Is it that occasionally you see timeouts, or is it for a particular route?

Just a particular route. It works without istio and we cannot seem to figure what is the issue. Only thing that the payload is JSON bigger than 10kb but i havent found any such limit googling for envoy