This module sends what may be helpful debugging information to the client, rather than to the error_log file.

This module specifies only the dump( ) method:

use Apache::Debug ( );
my $r = shift;
Apache::Debug::dump($r, "some comment", "another comment", ...);

For example, if we take this simple script:

use Apache::Debug ( );
use Apache::Constants qw(SERVER_ERROR);
my $r = shift;
Apache::Debug::dump($r, SERVER_ERROR, "Uh Oh!");

it prints out the HTTP headers as received by server and various request data:

SERVER_ERROR 

Uh Oh! 

cwd=/home/httpd/perl
$r->method            : GET
$r->uri               : /perl/test.pl
$r->protocol          : HTTP/1.0
$r->path_info         : 
$r->filename          : /home/httpd/perl/test.pl
$r->allow_options     : 8
$s->server_admin      : root@localhost
$s->server_hostname   : localhost
$s->port              : 8000
$c->remote_host       : 
$c->remote_ip         : 127.0.0.1
$c->remote_logname    : 
$c->user              : 
$c->auth_type         : 

scalar $r->args       : 

$r->args:

$r->content:

$r->headers_in:
   Accept       = image/gif, image/x-xbitmap, image/jpeg, 
                  image/pjpeg, image/png, */*
   Accept-Charset = iso-8859-1,*,utf-8
   Accept-Encoding = gzip
   Accept-Language = en
   Connection   = Keep-Alive
   Host         = localhost:8000
   Pragma       = no-cache
   User-Agent   = Mozilla/4.76 [en] (X11; U; Linux 2.2.17-21mdk i686)