/etc/apache2/mods-available/proxy_balancer.conf is in apache2.2-common 2.2.22-13+deb7u6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | <IfModule mod_proxy_balancer.c>
# Balancer manager enables dynamic update of balancer members
# (needs mod_status). Uncomment to enable.
#
#<IfModule mod_status.c>
#<Location /balancer-manager>
# SetHandler balancer-manager
# Order deny,allow
# Deny from all
# Allow from 127.0.0.1 ::1
# Satisfy all
#</Location>
#</IfModule>
</IfModule>
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