Haproxy config with routing

haproxy.conf

global
        log /dev/log    local0
        log /dev/log    local1 notice
        chroot /var/lib/haproxy
        stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
        stats timeout 30s
        user haproxy
        group haproxy
        daemon

        # Default SSL material locations
        ca-base /etc/ssl/certs
        crt-base /etc/ssl/private

        # Default ciphers to use on SSL-enabled listening sockets.
        # For more information, see ciphers(1SSL). This list is from:
        #  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
        # An alternative list with additional directives can be obtained from
        #  https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy
        ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
        ssl-default-bind-options no-sslv3

defaults
        log     global
        mode    http
        option  httplog
        option  dontlognull
        timeout connect 5000
        timeout client  50000
        timeout server  50000
        errorfile 400 /etc/haproxy/errors/400.http
        errorfile 403 /etc/haproxy/errors/403.http
        errorfile 408 /etc/haproxy/errors/408.http
        errorfile 500 /etc/haproxy/errors/500.http
        errorfile 502 /etc/haproxy/errors/502.http
        errorfile 503 /etc/haproxy/errors/503.http
        errorfile 504 /etc/haproxy/errors/504.http

frontend fe_http_in
        bind *:80
        mode http

        acl letsencrypt-acl path_beg /.well-known/acme-challenge/
        use_backend backend_letsencrypt_http if letsencrypt-acl

        redirect scheme https code 301 if !{ ssl_fc } !letsencrypt-acl
        default_backend backend_http_in

frontend fe_https_in
        bind *:443 ssl crt /etc/ssl/seoforge.xyz/seoforge.xyz.pem

        option forwardfor

        # Lets Encrypt endpoint (don't change this)
        acl letsencrypt-acl path_beg /.well-known/acme-challenge/
        use_backend backend_letsencrypt_https if letsencrypt-acl


        # Routing to different domains and sub domains
        acl host_server_a hdr(host) -i sub-domain.server-a.com
        use_backend backend_server_a if host_server_a

        # Routing to different domains and sub domains
        acl host_server_b hdr(host) -i server-b.com
        use_backend backend_server_b if host_server_b
        
        default_backend backend_https_in

backend backend_letsencrypt_http
        server letsencrypt 127.0.0.1:8080

backend backend_letsencrypt_https
        server letsencrypt 127.0.0.1:8443

backend backend_http_in
        mode http
        option forwardfor
        http-request set-header X-Forwarded-Port %[dst_port]
        server main_web_server main_web_server:80

backend backend_https_in
        mode http
        option forwardfor
        http-request set-header X-Forwarded-Port %[dst_port]
        server main_web_server main_web_server:80


backend backend_server_a
        mode http
        option forwardfor
        http-request set-header X-Forwarded-Port %[dst_port]
        server server_a server_a:80

backend backend_server_b
        mode http
        option forwardfor
        http-request set-header X-Forwarded-Port %[dst_port]
        server server_b server_b:80