13.7. cgi-test

Let's add to our black bag the following script:

#!/usr/bin/perl -Tw
use strict;
print "Content-type: text/plain

";
print "$_: $ENV{$_}
" for sort keys %ENV;
print "
Input:
";
print <STDIN>;

Use this whenever you have doubts about what a form is really sending to the server. Just make this script the target of the form action, and you'll get a terse dump of the environment variables and any content that the form sent via POST.