Using mod_proxy_balancer some client requests receive 503 response

Issue

• Testing a disaster recovery by making a node unavailable in a mod_proxy_balancer configuration similar to the following results in some clients receiving 503 responses:

<Proxy balancer://cluster1>
    BalancerMember http://member1:8180 route=member1 max=20 ttl=120
    BalancerMember http://member2:8180 route=member2 max=20 ttl=120
    ProxySet lbmethod=byrequests
    ProxySet stickysession=JSESSIONID
    ProxySet nofailover=Off
</Proxy>

• Clients are not stuck with a down node, however some requests are made and bring a 503 to clients