I had been having trouble gettng CGI.pm to recognize POSTed params under mod_perl. After much commenting of code, it appears the culprit is XML::Simple.

If you run the following (stripped down to show problem) script under normal cgi, and click the button, things work fine and you can see the form parameters (I Dump $q for convenience; in practice, I use $q->param()).

But if you run under mod_perl you don't see any POSTed params, although any in the query string do show.

Commenting out the "use XML::Simple", and all is well under mod_perl. Is there something else I'm missing or is XML::Simple doing something unexpected? Note that you don't even have to call any XML::Simple methods, just "use" it, to make this problem show up. 

#! /perl/bin/perl -w

use strict;
use CGI;
use Data::Dumper;
use XML::Simple;

print "Content-type: text/html\n\n";
print "<BODY><HTML>";

print '<h1>testing</h1>';
my $q = CGI::new;
print "<pre>" . Dumper($q) . '</pre>';

print qq[
<form method=post >
fld1 <input name=fld1 >
<br>fld2 <input name=fld2>
<br><input type=submit name=btn_submit value="submit">
</form>
];

print '</body></html>';

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In reply to XML::Simple.pm breaks CGI.pm under mod_perl? by voyager

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