Web Testing for Reliability Improvement - Advances in Computers - page 185

129.119.4.17 - - [16/Aug/1999:00:00:11 -0500] "GET
/img/XredSeal.gif HTTP/1.1" 301 328 "http://www.seas.smu.edu/"
"Mozilla/4.0 (compatible; MSIE 4.01; Windows NT)"
129.119.4.17 - - [16/Aug/1999:00:00:11 -0500] "GET
/img/ecom.gif HTTP/1.1" 304 - "http://www.seas.smu.edu/"
"Mozilla/4.0 (compatible; MSIE 4.01; Windows NT)".
F IG . 2. Sample entries in an access log.
The reverse-DNS hostname of the machine making the request. If the machine
has no reverse-DNS hostname mapped to the IP number, or if the reverse-DNS
lookup is disabled, this will just be the IP number.
The user name used in any authentication information supplied with the request.
If “identd” checking is turned on, the user name as returned by the remote host.
Date and time that the transfer took place, including offset from Greenwich
Mean Time.
The complete first line of the HTTP request, in quotes.
The HTTP response code.
Total number of bytes transferred.
The referrer, or the source page that lead to the current access.
The agent, or the information that the client browser reports about itself.
If the value for any of these data fields is not available, a “ − ” will be put in its
place. Most of the above information is available from most web logs despite minor
variations in web log configurations and information contents across different web
servers.
Error logs typically include details about the problems encountered. The format
is simple: a time-stamp followed by the error or warning message, such as in Fig. 3 .
[Mon Aug 16 13:17:24 1999] [error] [client 207.136.6.6]
File does not exist: /users/seasadm/webmastr/htdocs/
library/images/gifs/homepage/yellowgradlayers.gif
[Mon Aug 16 13:17:37 1999] [info] [client 199.100.49.104]
Fixed spelling: /img/XredSeal.gif to /img/xredSeal.gif
from http://www.seas.smu.edu/
F IG . 3. Sample entries in an error log.