Haproxy Beginner Problem!

Question

Hello everyone, I currently am using haproxy to do reverse_proxy on my end.

Unfortunately, I cannot get it to work!.

This is my config:

backend twisted 
        mode http
        timeout connect 10s
        timeout server 30s
        balance roundrobin
        server apache1 127.0.0.1:11111 weight 1 maxconn 512

backend cometd
        mode http
        timeout connect 5s
        timeout server 5m
        balance roundrobin
        server cometd1 127.0.0.1:12345 weight 1 maxconn 10000

frontend http_proxy #arbitrary name for the frontend
        bind *:80 #all interfaces at port 80
        mode http
        option forwardfor
        option http-server-close
        option http-pretend-keepalive
        default_backend twisted #by default forward the requests to apache

        acl req_cometd_path path_beg /comet/
        use_backend cometd if req_cometd_path 

        acl req_cometd_host hdr_dom(host) -i comet.okiez.com
        use_backend cometd if req_cometd_host

1. If I try to access localhost/comet/test1/test2, haproxy forwards to the cometd backend correctly. However, the request path remains to be /comet/test1/test2, where my comet engine (orbited) doesn't handle the /comet/ part. Is there anyway to tell haproxy to drop the first /comet/ in the requests that gets directed to the cometd backend?
2. As you can see, I have acl req_cometd_host hdr_dom(host) -i comet.okiez.com too. This simply stopped working. I don't know if accessing http://comet.localhost/test1/test2 or http://comet.127.0.0.1/test1/test2 makes any sense at all. How can I write acl req_cometd_host hdr_dom(host) -i to for localhost addresses?