For httpd server logging, W3C logging format is preferred, with the agent and referrer extensions in separate files. To enable logging, set the CustomLog fields in the httpd.conf files as follows:

LogFormat "%h %l %u %t \"%r\" %s %b" common
LogFormat "%{Referer}i-> %U" referer
LogFormat "%{User-agent}I" agent
CustomLog /path/to/audit/logs/access_log common
CustomLog /path/to/audit/logs/referer_log referer
CustomLog /path/to/audit/logs/agent_log agent

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