Http frontend to https Backend on selected paths

I have two incoming requests, one of it needs to go to a “http:// server” and other to “https:// server”.
Below is my acl and backend definitions

------in haproxy_peers.cfg---------
acl downstream_service1 path_beg /downstream_serv1/internal/api
acl downstream_service2 path_beg /downstream_serv2/internal/api

use_backend downstream_serv1_http if downstream_service1
use_backend downstream_serv2_https if downstream_service2
------------------------------------------

backend configs:

--------in backend config file-----------
backend downstream_serv1_http
    http-request set-path "%[path,regsub(^/downstream_serv1/,/)]"
        server  downstream_server1   host-name.domain:port_number check         //*note there is no http/https protocol mentioned.*

backend downstream_serv2_https
    http-request set-path "%[path,regsub(^/downstream_serv2/,/)]"
        server  downstream_server2   host-name2.domain:port_number check      //*note there is no http/https protocol mentioned.*
---------------------------------------------

Expectation is
http://haproxyHost/downstream_serv1/internal/api should be routed to http://host-name.domain:port_number/internal/api

http://haproxyHost/downstream_serv2/internal/api should be routed to https://host-name2.domain:port_number/internal/api

Any help here please?