http-request return bytes_read from v2.3 to v2.4

[William Dauchy]

Hello,

While upgrading from v2.3.x to v2.4.x I noticed a difference of bytes
read in requests http logs with this simple frontend config:

frontend foo
        bind 127.0.0.1:8000
        http-request return

in v2.3, the logs (%B) tells me 54 bytes, in v2.4, I am getting 49. So
a difference of 5 bytes per request.

I was simply curious to understand that behavior change. Is it a
change in the way we count bytes in stats, or is there really a
difference in the payload we write?
When I look at a dump, the TCP payloads are identical with 57 bytes in
both versions. And the overall length of the packet is 123 bytes.
Maybe that's expected, but I wanted some clarification.

Thanks,
-- 
William