haproxy backend redirect based on path

问题:

is there a way to redirect to a specific backend, based on the path?

Goal: http://example.com/node1 --> use backend myserver:8080
      http://example.com/node2 --> use backend myserver:8081
      http://example.com/node3 --> use backend myserver:8082
      http://example.com/ --> use backend myserver:8080, 8081, 8082

This is my configuration:

frontend
...
       acl head_domain hdr_beg(host) -i example.com
       acl head_n1 path_beg -i /node1
       acl head_n1_ref hdr_dir(Referer) -i /node1
       use_backend be_n1 if head_n1_ref head_domain
       use_backend be_n1 if head_n1 head_domain
       use_backend sall if head_domain !head_n1_ref !head_n1

...same for other nodes


backend sall
    balance leastconn
    mode http
    option forwardfor
    stick-table type ip size 200k expire 1h
    stick on src
    #default-server inter 2s
    server s_1 myserver:8080 check
    server s_2 myserver:8081 check
    server s_3 myserver:8082 check

backend be_n1
    mode http
    reqirep ^([^\ :]*)\ /node1(.*)   \1\ /\2
    server s_n1 myserver:8080

backend be_n2
    mode http
    reqirep ^([^\ :]*)\ /node2(.*)   \1\ /\2
    server s_n2 myserver:8081

...

This works partly. I can enter example.com/node1 and I'm being redirected to node1 on "/". But as soon as I click somehwere, I'm going via "backend sall" since all links on the page don't have the "/node1" in it. How can I rewrite the urls on the page, so that all will have a /node1/ in it, when I'm going via /node1 ? The haproxy should remove this /node1/ again, which is already happening on the backend config. But the response also has all /node1 removed, so all further clicks will go via the sall backend :/