I am currently doing a POC on haproxy.
Haproxy gives the TR time which is time required to receive the first byte of header to last byte of header.
I want to use this TR time for my purpose.
I want haproxy to return TR time in response without going to backend server.
To send TR time in response
I am using following modification in frontend
http-after-response set-header tproxy "%TR"
But in response I am getting -1 for TR whereas if I use log-format then it prints the correct value
How do I get the correct TR value in response of my request