Version - Apache: 2.4.29
In summary, I am observing that BALANCER_WORKER_ROUTE, BALANCER_WORKER_CHANGED, etc. environment variables are not set until AFTER the selected balancerMember host has responded. How can I determine which balancerMember has been selected BEFORE the initial request is sent to the balancerMember host to allow for altering or adding headers to that initial request?
<Proxy "balancer://myappinstances">
BalancerMember "http://mydomain.com:9080/myapp"; route=app1
BalancerMember "http://mydomain2.com:9080/myapp"; route=app2
ProxySet stickysession=SERVERID
</Proxy>
<Location "/myapp">
Header add Set-Cookie "SERVERID=myapp.%{BALANCER_WORKER_ROUTE}e; path=/myapp" env=BALANCER_ROUTE_CHANGED
ProxyPass balancer://myappinstances stickysession=SERVERID nofailover=on
ProxyPassReverse balancer://myappinstances
</Location>
Thanks!
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