HAProxy - URL Based routing with load balancing

Question

I am new to HAProxy and I have a question about HAProxy configuration which helps me make a key decision in taking the right approach. This will greatly help me deciding the

Answer 1

You can segregate requests based on URL and load balance with a single HAProxy server. Your configuration will have something like this:

frontend http
acl app1 path_end -i /app1/123 #matches path ending with "/app/123"
acl app2 path_end -i /app2/123 
acl app3 path_end -i /app3/123 


use_backend srvs_app1    if app1
use_backend srvs_app2    if app2
use_backend srvs_app3    if app3

backend srvs_app1 #backend that lists your servers. Use a balancing algorithm as per your need.
   balance roundrobin 
   server host1 REGION1_HOST_FOR_APP1:PORT 
   server host2 REGION2_HOST_FOR_APP1:PORT

backend srvs_app2
   balance roundrobin
   server host1 REGION1_HOST_FOR_APP2:PORT 
   server host2 REGION2_HOST_FOR_APP2:PORT

backend srvs_app3
   balance roundrobin
   server host1 REGION1_HOST_FOR_APP3:PORT 
   server host2 REGION2_HOST_FOR_APP3:PORT

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