error_log:
[Fri Jan 27 15:38:47 2006] [info] disk_cache: Serving Cached URL lindbeer-5.student.rose-hulman.edu/test.php?
[Fri Jan 27 15:38:47 2006] [info] disk_cache: Served headers for URL lindbeer-5.student.rose-hulman.edu/test.php?
[Fri Jan 27 15:38:47 2006] [debug] mod_cache.c(218): cache: stale cache - test conditional
[Fri Jan 27 15:38:47 2006] [debug] mod_cache.c(222): cache: conditional - add cache_in filter and DECLINE
[Fri Jan 27 15:38:47 2006] [debug] mod_cache.c(157): cache: no cache - add cache_in filter and DECLINE
[Fri Jan 27 15:38:47 2006] [debug] mod_cache.c(406): cache: running CACHE_IN filter
[Fri Jan 27 15:38:47 2006] [debug] mod_cache.c(570): cache: /a.php not cached. Reason: Response status 0
[Fri Jan 27 15:38:47 2006] [debug] mod_cache.c(406): cache: running CACHE_IN filter
[Fri Jan 27 15:38:47 2006] [debug] mod_cache.c(570): cache: /test.php not cached. Reason: Response status 0

access_log:
137.112.146.94 - - [27/Jan/2006:15:38:47 -0500] "GET /a.php HTTP/1.0" - 290 "-" "-"
137.112.146.225 - - [27/Jan/2006:15:38:47 -0500] "GET /test.php HTTP/1.1" - 299 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.8) Gecko/20051111 Firefox/1.5"

php log:
[27-Jan-2006 15:38:47] PHP Warning:  Unknown: failed to open stream: Permission denied in Unknown on line 0
[27-Jan-2006 15:38:47] PHP Warning:  Unknown: Failed opening '/var/www/html/a.php' for inclusion (include_path='.:/usr/lib/php/:/usr/share/pear/') in Unknown on line 0
[27-Jan-2006 15:38:47] PHP Warning:  file_get_contents(http://lindbeer-5.student.rose-hulman.edu/a.php) [<a href='function.file-get-contents'>function.file-get-contents</a>]: failed to open stream: HTTP request failed! HTTP/1.1 500 Internal Server Error
 in /var/www/html/test.php on line 6