server config, <VirtualHost>, <Global>
1.2.8rc1 and later
By default, mod_cap removes all but two capabilities from the session-handling process: CAP_NET_BIND_SERVICE, for binding to ports lower than 1024 (required for active data transfers), and CAP_CHOWN, for allowing a process to change a file's ownership to a different user. The latter capability is only strictly necessary if the UserOwner configuration directive is in use; if not being used, the CAP_CHOWN capability is best removed. The CapabilitiesSet directive is used to manipulate the set of capabilities that mod_cap grants.
To remove a capability, prefix the name with a '-'; to enable a capability, use '+'. At present, this directive only supports one capability: CAP_CHOWN.