Is possible to select backed according to host and then in backend section select server according to the url

The config like :

acl acl_site1 hdr(host) -i www.site1.com

use_backend server_site1 if acl_site1

backend server_site1

    acl acl_site1_path1 path_beg -i /path1     acl acl_site1_path2 path_beg -i /path2

    use_server svr1 if acl_site1_path1
    use_server svr2 if acl_site1_path2

  server svr1 1.2.3.4
  server srv2 1.2.3.5 Received on 2008/07/03 09:39