This is a log format defined by the W3C which can contain a variable amount of information. The format is defined at http://www.w3.org/TR/WD-logfile.html.
This log format uses a header to specify the order of the fields present in the log file.
Lire can use the following fields of the format:
date,
time,
c-ip,
c-dns,
cs-uri,
cs-method,
sc-bytes,
sc-status,
cs(User-Agent),
cs(Referer),
cs-uri-stem
and
cs-username.
The other fields will be ignored.