init variable from ACL condition

[Jérôme Saada]

hello,

i would like to change the backend's port dynamically,
is it possible to do something like:


frontend  main
    acl myport=3000 path_beg -i /uri_one
    acl myport=3001 path_beg -i /uri_two

backend back
    server      web1 localhost:${myport}


today, for this purpose i have to create multiple backend for each port

thanx for any help