How to detect HTTP TCP client connection closed ? -Reqwest

Hey everyone how to detect whether TCP connection is closed ?
There is keep-alive settings (http2_keep_alive_interval,tcp_keepalive etc..) for ClientBuilder but i didint see difference when i dont use too.(Did some tests like exceeding timeouts)

For example there is Connection ID in chrome dev console we are able to see whether connection is closed .

Is there something like that in the reqwest ?