PostgreSQL HA using HAProxy and Patroni

I am currently trying to deploy Load Balancing using HAProxy for my PostgreSQL cluster (used Patroni HA solution). Now, I have been able to successfully implement the setup and Load Balancing is working to an extent. My HAProxy configuration : global maxconn 100 defaults log global mode tcp retries 2 timeout client 30m timeout connect 4s timeout server 30m timeout check 5s listen stats mode http bind *:7000 stats enable stats uri / listen read_write bind *:5004 option httpchk OPTIONS /master http-check expect status 200 default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions server pg1 IP:5432 maxconn 100 check port 8008 server pg2 IP:5432 maxconn 100 check port 8009 listen read_only bind *:5005 mode tcp balance roundrobin http-check expect status 200 default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions server pg1 IP:5432 maxconn 100 check port 8008 server pg2 IP:5432 maxconn 100 check port 8009 However, my question is how will the application interact with HAProxy for read only requests. Does the application need to connect using port 5005 or is there any internal logic applied by HAProxy to do this. This is my first time implementing a Load Balancing setup, hence would appreciate your patience. :)