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Reply to topic   Topic: Perl How to pass POST/GET values to Error 500 handler?

Joined: 29 Mar 2011
Posts: 4

PostPosted: Fri 01 Apr '11 19:00    Post subject: Perl How to pass POST/GET values to Error 500 handler? Reply with quote

I've got a PERL script that handles all my Error 500 Internal Errors by e-mailing me all the HTTP Environment variables.

What I also want to include is all the POST/GET variable values when the error occurred. But because it is a redirect the values are all empty. My script looks like this:

use CGI qw(:all);


foreach $key (sort keys(%ENV)) {
print SENDMAIL "$key = $ENV{$key}\n";


foreach my $p (param()) {
print SENDMAIL "$p=".param($p)."\n";

I'm thinking this might be more of an Apache config (.htaccess) issue than a PERL issue but just throwing it out there. My .htaccess says:

ErrorDocument 500 /cgi-bin/error500.cgi

I'm wondering if the only solution is to use some sort of syntax to append all the variable values onto the end?

Or, maybe it is just not possible?
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James Blond

Joined: 19 Jan 2006
Posts: 6824
Location: Germany, Next to Hamburg

PostPosted: Tue 05 Apr '11 14:39    Post subject: Reply with quote


sub populateQueryFields {
   %queryString = ();
   my $tmpStr = $ENV{ "QUERY_STRING" };
   @parts = split( /\&/, $tmpStr );
   foreach $part (@parts) {
      ( $name, $value ) = split( /\=/, $part );
      $queryString{ "$name" } = $value;

populateQueryFields pulls all name/value pairs from a URL (GET
request) into a hash called %queryString.


sub populatePostFields {
   %postFields = ();
   read( STDIN, $tmpStr, $ENV{ "CONTENT_LENGTH" } );
   @parts = split( /\&/, $tmpStr );
   foreach $part (@parts) {
      ( $name, $value ) = split( /\=/, $part );
      $value =~ ( s/%23/\#/g );
      $value =~ ( s/%2F/\//g );
      $postFields{ "$name" } = $value;

pulls all data from a POST request (via STDIN) into a hash called

an HTML form->POST request,

<FORM ACTION="../cgi-bin/script.pl" METHOD="POST">

$firstName = $postFields{ "fname" };
$lastName = $postFields{ "lname" };

Would, once again, pull the respective data entered via the HTML
form into the $firstName and $lastName fields.

One additional note: In the populatePostFields routine, there are
two calls to s///. These are optional, and mimic (lightly) the
functionality of an unEscape() or urlDecode() type of procedure. The
specific two calls made in the routine above replace "%23" with a
pound (#) sign, and "%2F" with a forward slash (/). These can be
altered as you see fit.

found at http://www.howtodothings.com/computers/a1297-how-to-access-get--post-request-data-using-perl.html
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Joined: 29 Mar 2011
Posts: 4

PostPosted: Tue 05 Apr '11 16:58    Post subject: Reply with quote

After further investigation what I want to do does not look like it is possible.

The reason is the Custom Error Handler directive for Apache causes apache to redirect and not pass the POST values to the error handler script. It passes just about any other info you could be interested in but not that.

The only way we be to reconfigure the form to submit the values using GET and the variable names and values would be passed in REDIRECT_QUERY_STRING.

See http://httpd.apache.org/docs/2.0/custom-error.html

There are so many different forms and on some dozens of values, this would be a very clunky way to debug as some of the URLs would be HUGE due to the gigantic query string with all the variables.
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