Apache Server for Windows Little Black Book:Making Your Site Dynamic Through CGI
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Apache’s CGI Debugging Directives
Debugging CGI scripts is a tedious and often difficult task. Apache includes logs that record CGI output. You can also use directives that are provided by mod_cgi help developers to track down errors.


TIP:  If you use the Perl module CGI.pm or an application like WinPerl, you can do a lot of script debugging. WinPerl provides detailed error reports, and CGI.pm lets you do interactive debugging—you enter key/pairs as you would in a Web-page form, and CGI.pm provides output.

You can follow these steps to track errors recorded in Apache’s CGI error logs:


1.  Open srm.conf in Notepad.
2.  Enter the ScriptLog directive, which identifies the log file name for CGI errors. ScriptLog follows this syntax:


ScriptLog path-to-logfile


If path-to-logfile does not begin with a forward-slash (/), it is considered relative to the directory identified by the ServerRoot directive.
3.  Optionally, you can limit the size of the CGI log. Otherwise, the log file can grow rapidly as CGI errors are encountered. To do so, use the ScriptLogLength directive, which has this syntax:


ScriptLogLength size


The size is given in bytes; the default size is 10385760 bytes, which is 10.38MB.
4.  Additionally, you can limit the size of any data that is submitted by POST or PUT. This, too, is given in bytes; the default is 1024 bytes.
These three directives might look like this:


ScriptLog C:/www/Apache/logs/cgi.log
ScriptLogLength 16000000
ScriptLogBuffer 1024


5.  Choose File|Save to save your changes, and restart Apache.

Be aware that, although recording CGI errors is helpful when you are debugging, you should probably comment out these lines after your script has been checked. Daily logging of all CGI errors can slow down your server performance—and the log files can grow very large very fast.




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