'ha-proxy using a query parameter as a heather

I need to read one parameter from the query string and use is a heather. i tried a few option but none seems to work. Here is my example

--- sample query ---

--ha-proxy frontend --

frontend lb_test

bind :443 ssl crt /etc/ssl/certs/mycert.pem

mode http

acl the_param2 { query -m sub -i param2= }

http-request add-header X-VALUE the_param2

use_backend lb_test if the_param2

--- ha-proxy backend ---

backend lb_test

balance roundrobin

server srv1 x.x.x.x:<port_number> check

Thanks in advance!

regards

query-string haproxy

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