HAProxy URL + cookies Based routing with load balancing

@pankaj.ghadge wrote:

I have 2 server witch run behind HaProxy Load balancer.

Here scenario is that application opens new popup window and it doesn’t carry forward parent cookies in pop up window, so it doesn’t know which back-end server will serve the request, so we have planned to pass it in URL like for initial request

Next request which comes after this will have the SERVERID as cookie, so here default haproxy backend will take care where to send the request

example. com/?balancer=app1 (This request should go to app1 server in backend)

OR

example. com/?balancer=app2 (This request should go to app2 server in backend)

I have 3 questions

1. Is it possible using below Haproxy configuration ?

2. How can I simplify this configuration ?

3. if argument is in middle like http://example.com/?id=10&balancer=app2&product_id=110 , then what will be the conditional check in Haproxy configuration?

   frontend app-frontend
   bind 127.0.0.1:9005
   mode http
   acl app1_url urlp_reg(balancer) ^app1$
   acl app2_url urlp_reg(balancer) ^app2$
   use_backend app1_backend if app1_url
   use_backend app2_backend if app2_url
   default_backend app-backend

   backend app-backend
   mode http
   option httpclose
   balance leastconn
   cookie SERVERID insert indirect nocache
   server app1 10.168.1.10:80 check cookie app1
   server app2 10.168.1.20:80 check cookie app2

   backend app1_backend:
   mode http
   option httpclose
   balance leastconn
   cookie SERVERID insert indirect nocache
   server app1 10.168.1.10:80 check cookie app1

   backend app2_backend:
   mode http
   option httpclose
   balance leastconn
   cookie SERVERID insert indirect nocache
   server app2 10.168.1.20:80 check cookie app2

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