Timber parses the traditional Apache HTTP server log formats, both the access and error log formats. In practice they look like this:
127.0.0.1 - frank [10/Oct/2000:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326
[Fri Sep 09 10:42:29.902022 2011] [core:error] [pid 35708:tid 4328636416] [client 18.104.22.168] File does not exist: /usr/local/apache2/htdocs/favicon.ico
These fields will be mapped to their appropriate Timber log event JSON schema fields.