mod_cgi.c file, and
is compiled in by default. It provides for execution of CGI scripts.
Any file with mime type
application/x-httpd-cgi will be
processed by this module.
cgi-script (Apache 1.1 or later)
will be treated as a CGI script, and run by the server, with its output
being returned to the client. Files acquire this type either by
having a name ending in an extension defined by the
AddType directive, or by being in
a ScriptAlias directory.
When the server invokes a CGI script, it will add a variable called
DOCUMENT_ROOT to the environment. This variable will contain the
value of the DocumentRoot
%% [time] request-line %% HTTP-status CGI-script-filenameIf the error is that CGI script cannot be run, the log file will contain an extra two lines:
%%error error-messageAlternatively, if the error is the result of the script returning incorrect header information (often due to a bug in the script), the following information is logged:
%request All HTTP request headers received POST or PUT entity (if any) %response All headers output by the CGI script %stdout CGI standard output %stderr CGI standard error(The %stdout and %stderr parts may be missing if the script did not output anything on standard output or standard error).
The ScriptLog directive sets the CGI script error logfile. If no ScriptLog is given, no error log is created. If given, any CGI errors are logged into the filename given as argument. If this is a relative file or path it is taken relative to the server root.
Note that script logging is meant to be a debugging feature when writing CGI scripts, and is not meant to be activated continuously on running servers. It is not optimized for speed or efficiency, and may have security problems if used in a manner other than that for which it was designed.
ScriptLogLength can be used to limit the size of the CGI
script logfile. Since the logfile logs a lot of information per CGI
error (all request headers, all script output) it can grow to be a big
file. To prevent problems due to unbounded growth, this directive can
be used to set an maximum file-size for the CGI logfile. If the file
exceeds this size, no more information will be written to it.
Syntax: ScriptLogBuffer size
Context: resource config
The size of any PUT or POST entity body that is logged to the file is limited, to prevent the log file growing too big too quickly if large bodies are being received. By default, up to 1024 bytes are logged, but this can be changed with this directive.