Part III Running Web Applications in VS .NET

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Part III Running Web Applications
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Enabling CGI Debugging Support in Apache
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To help CGI developers, Apache has logs for CGI output For each CGI program error, the log file contains a few lines of log entries The first two lines contain the time of the request, the request URI, the HTTP status, the CGI program name, and so on If the CGI program cannot be run, two additional lines contain information about the error Alternatively, if the error is the result of the script returning incorrect header information, the information is logged in as: all HTTP request headers, all headers outputted by CGI program, and STDOUT and STDIN of the CGI program If the script failed to output anything, the STDOUT will not be included To log CGI output in Apache, use the directives described in the following sections in the mod_cgi module, which is part of standard distribution With these directives you can set up the logging of CGI programs that you are developing or attempting to install on your system
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ScriptLog
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The ScriptLog directive sets the log filename for CGI program errors If the log filename is relative (that is, it does not start with a leading /), it is taken to be relative to the server root directory set by ServerRoot directive Syntax: ScriptLog filename Context: Resource config
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When you use this directive, make sure that the log directory is writeable by the user specified by UserDir directive Using this directive on a daily basis might not be a good idea as far as efficiency or performance goes I recommend using it when needed and turning it off when the debugging is completed
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ScriptLogLength
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The ScriptLogLength directive limits the size of the log file specified by the ScriptLog directive The script log file can log a lot of information per CGI error and, therefore, can grow rapidly By using this directive, you can limit the log size so that when the file is at the maximum length, no more information will be logged Syntax: ScriptLogLength size Default: ScriptLogLength 10385760 Context: Resource config
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12 Running CGI Scripts
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ScriptLogBuffer
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The ScriptLogBuffer directive limits the size of POST or PUT data that is logged Syntax: ScriptLogBuffer size Default: ScriptLogBuffer size 1024 Context: Resource config
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Debugging Your Perl-Based CGI Scripts
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If you use Perl-based CGI scripts, as discussed earlier in this chapter, you have lot more help in troubleshooting your CGI scripts than just what Apache offers as CGI logs You can debug a Perl-based CGI script from the command line by using the famous CGIpm module Or, you can write debug messages to the standard error log (STDERR) file, which Apache automatically redirects to the Apache error log I will discuss these techniques in the following sections
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Debugging from the command line
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If you use the famous CGI module, as I did in all of the practical CGI scripts discussed in this chapter, you are in luck The CGI module enables you to troubleshoot your CGI script from the command line, which makes it really convenient to debug a script Let s look at an example CGI script called badcalcpl, which is shown Listing 12-7
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Listing 12-7: badcalcpl
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#!/usr/bin/perl -w use CGI; my $query = new CGI; my $num1 = $query->param( num1 ); my $num2 = $query->param( num2 ); my $sum = $num1 + num2; #print $query->header; print $num1 + $num2 = $sum ; exit 0;
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Part III Running Web Applications
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When this script is accessed via a URL such as http://wwwdomaincom/cgi-bin/ notreadypl, it returns an internal server error message and logs an error message in the server s error log file You want to know why this small script does not work Here is a typical debugging session 1 Enable command-line debugging for the CGI module by changing the use CGI line to:
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Use CGI qw(-debug);
This enables the command-line debugging for the module 2 As root, su to the Apache user (that is, the user you set the User directive to) and run the script from the command line You will see this message:
(offline mode: enter name=value pairs on standard input)
and the script will wait for your input 3 In command-line mode, enter key=value pairs in each line to simulate input from the Web For example, to feed the above script, an example command-line session would look similar to this: