Need help with multiple domains, one public IP

Hi, everyone. I’m new here so pardon me if I’m missing any rules.

I need help with my haproxy configuration. I should say I’m also brand new to haproxy so my knowledge gaps will likely be obvious to everyone. Here’s my scenario: I have 2 similar applications that both require the use of port 80/tcp and 443/tcp. Each application sits on its own server with a private IP address behind the single (shared) public address. I have been struggling for a while now with getting haproxy to help direct traffic to both servers. I’ve read that I need to set sticky urls or something like that, in addition to everything else I need to do, but I’m totally clueless on what to do and how to make this work. I need that if users type domain1.com, they should be directed to server1 in my private network and if they type domain2.com, then the traffic should be routed to server2. I should mention that each application has its own letsencrypt certificate. Here’s the configuration I’ve come up with so far.

frontend http_in
        mode http
        option httplog
        bind *:80
        # option forwardfor
        reqadd X-Forwarded-Proto:\ http

        acl host_server1 hdr(host) -i my.domain1.com
        acl host_server2 hdr(host) -i my.domain2.com

        use_backend http_domain1 if host_server1
        use_backend http_domain2 if host_server2


backend http_domain1
        mode http
        option httplog
        # option forwardfor
        redirect scheme https if !{ ssl_fc }
        server server1 192.168.1.100:80 check

backend http_domain2
        mode http
        option httplog
        # option forwardfor
        redirect scheme https if !{ ssl_fc }
        server server2 192.168.1.110:80 check


frontend https_in
        bind *:443 ssl crt /etc/haproxy/certs/
        reqadd X-Forwarded-Proto:\ https
        acl letsencrypt-acl path_beg /.well-known/acme-challenge/
        use_backend letsencrypt-backend if letsencrypt-acl

        acl host_server1 hdr(host) -i my.domain1.com
        acl host_server2 hdr(host) -i my.domain2.com

        use_backend https_domain1 if host_server1
        use_backend https_domain2 if host_server2


backend https_domain1
        mode http
        option httplog
        # option forwardfor
        redirect scheme https if !{ ssl_fc }
        server server1 192.168.1.100:443 check

backend https_domain2
        mode http
        option httplog
        # option forwardfor
        redirect scheme https if !{ ssl_fc }
        server server2 192.168.1.100:443 check


backend letsencrypt-backend
server letsencrypt 127.0.0.1:54321

I’ve not even been able to get past just validating the code, it always errors. Any and all help would be appreciated here. Thanks.

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