how can %{BALANCER_WORKER_ROUTE}e be null

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http://serverfault.com – I'm trying to set up a balanced cluster with mod_proxy_balancer. I followed the example line from here to set a cookie. I have had to tweak it as the environment is not stable so not every request will return a 200 code. Header always add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; <Proxy balancer://cluster> BalancerMember http://server1.example.com route=share2 BalancerMember http://server2 example.com route=share1 </Proxy> ProxyPass /balancer balancer://cluster/ stickysession=JSESSIONID|jsessionid nofailover=On ProxyPassReverse /balancer balancer://cluster/ (I kn (HowTos)