Send TR time in response of request

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

tproxy
	-1

How do I get the correct TR value in response of my request

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