modcluster/mod_cluster — pull request #65 by jfclere (2014-03-04 10:40:17+00:00)
Title: Fix for MODCLUSTER-391 in fact in the branch httpd cores :-(

I was just using:
CreateBalancers 2

BalancerMember ajp://127.0.0.1:8009
#ProxySet failonstatus=405,401

got a core in httpd-2.4.2 so the fix should help.