How to link frontend to backend when the path request are different? - haproxy

Question

I have an Haproxy set with https offloadin, and I'm trying to correctly point the requests made to frontend to it's corresponding backend, but bumped into some obstacles.
I have a backend server on http://:9000/abc (NOT in root of the webserver) and when I set a frontend with https:///abc the pointing works as expected and I see the login page.
But I also have another backend server, which is on http://:8888 (IN the root of webserver, it makes it's own redirect to http://:8888/def) and I want it to be accessible by https:///def. But in this case the pointing doesn't work.
How can I make https:///def point to http://:8888 ? Heres is my .cfg
Using HAproxy 1.7
# Automaticaly generated, dont edit manually.
# Generated on: 2019-01-28 13:59
global
maxconn 1000
stats socket /tmp/haproxy.socket level admin
uid 80
gid 80
nbproc 1
hard-stop-after 15m
chroot /tmp/haproxy_chroot
daemon
tune.ssl.default-dh-param 2048
server-state-file /tmp/haproxy_server_state
listen HAProxyLocalStats
bind 127.0.0.1:2200 name localstats
mode http
stats enable
stats refresh 10
stats admin if TRUE
stats show-legends
stats uri /haproxy/haproxy_stats.php?haproxystats=1
timeout client 5000
timeout connect 5000
timeout server 5000
frontend shared-frontend-merged
bind 200.129.168.14:443 name 200.129.168.14:443 no-sslv3 ssl crt-list /var/etc/haproxy/shared-frontend.crt_list
mode http
log global
option http-keep-alive
option forwardfor
acl https ssl_fc
http-request set-header X-Forwarded-Proto http if !https
http-request set-header X-Forwarded-Proto https if https
timeout client 30000
acl aclcrt_shared-frontend var(txn.txnhost) -m reg -i ^ifamcmc\.ddns\.net(:([0-9]){1,5})?$
acl ACL1 var(txn.txnpath) -m sub -i abc
acl ACL2 var(txn.txnpath) -m sub -i def
http-request set-var(txn.txnhost) hdr(host)
http-request set-var(txn.txnpath) path
use_backend glpi_ipvANY if ACL1
use_backend ciweb_ipvANY if ACL2
frontend http-to-https
bind 200.129.168.14:80 name 200.129.168.14:80
mode http
log global
option http-keep-alive
timeout client 30000
http-request redirect scheme https
backend abc_ipvANY
mode http
id 102
log global
timeout connect 30000
timeout server 30000
retries 3
option httpchk OPTIONS /
server abc 10.100.0.30:9000 id 103 check inter 1000
backend def_ipvANY
mode http
id 104
log global
timeout connect 30000
timeout server 30000
retries 3
option httpchk OPTIONS /
server def 10.100.0.40:8888 id 105 check inter 1000
I expect that access to https:///def correctly points to the backend at http://:8888
https://<my.address.com>/abc ------> http://<internal_ip>:9000/abc (OK)
https://<my.address.com>/def ------> http://<internal_ip_2>:8888 (NOT OK)

Answer 1

Have your HAProxy system do initially forwarding based on ports, and then wildcards on your directory.
Please see below:
frontend a-frontend-conf
# Declare an ACL using path_beg (Path Begins)
acl path_images path_beg /images
# Use backend server1 if acl condition path_images is fulfilled
use_backend server1 if path_images
backend server1
[...]
Source: https://serverfault.com/questions/659793/haproxy-how-to-balance-traffic-within-directory-reached