frontend http-in

    bind 10.254.23.225:80

    acl has_special_uri path_beg /special

    use_backend special_server if has_special_uri

    default_backend default

backend default

    balance roundrobin

    cookie SERVERID insert

    option httpchk HEAD /check.txt HTTP/1.0

    option httpclose

    option forwardfor

    server webA 10.254.23.4:80 cookie webA check

    server webB 10.248.23.128:80 cookie webB check

backend special_server

    balance roundrobin

    cookie SERVERID insert

    option httpchk HEAD /check.txt HTTP/1.0

    option httpclose

    option forwardfor

    server webC 10.0.0.1:80 cookie webC check