File apache2-mod_log_config.conf of Package apache2

#
# The following directives define some format nicknames for use with
# a CustomLog directive.
#
# http://httpd.apache.org/docs-2.2/mod/mod_log_config.html
#

#
#         Format string:				Nickname:
#
LogFormat "%h %l %u %t \"%r\" %>s %b"			common
LogFormat "%v %h %l %u %t \"%r\" %>s %b"		vhost_common
LogFormat "%{Referer}i -> %U"				referer
LogFormat "%{User-agent}i"				agent
LogFormat "%h %l %u %t \"%r\" %>s %b \
\"%{Referer}i\" \"%{User-Agent}i\""			combined
LogFormat "%v %h %l %u %t \"%r\" %>s %b \
\"%{Referer}i\" \"%{User-Agent}i\""			vhost_combined

# To use %I and %O, you need to enable mod_logio
<IfModule mod_logio.c>
LogFormat "%h %l %u %t \"%r\" %>s %b \
\"%{Referer}i\" \"%{User-Agent}i\" %I %O"		combinedio
</IfModule>

# Use one of these when you want a compact non-error SSL logfile on a virtual
# host basis:
<IfModule mod_ssl.c>
Logformat "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \
\"%r\" %b"						ssl_common
Logformat "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \
\"%r\" %b \"%{Referer}i\" \"%{User-Agent}i\""		ssl_combined
</IfModule>