Simple log format directives
%b- Bytes sent in response to the request (not including the HTTP
headers
%f- Filename sent
%h- Remote host
%l- Remote logname from ident if supplied
%r- The first line of the request
%s- Status code
%t- The time of the request in the format
[16/Jul/1997:22:49:25 +0100]
%U- The URL requested