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Environment Variables
This module keeps track of two additional (non-standard) CGI/SSI environment variables named SCRIPT_URL and SCRIPT_URI. These contain the logical Web-view to the current resource, while the standard CGI/SSI variables SCRIPT_NAME and SCRIPT_FILENAME contain the physical System-view.

Notice: These variables hold the URI/URL as they were initially requested, i.e., before any rewriting. This is important because the rewriting process is primarily used to rewrite logical URLs to physical pathnames.

RewriteRule ".*index\.html" /cgi-bin/env.pl/$1

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#!/usr/bin/perl

use strict;

##
##  printenv -- demo CGI program which just prints its environment
##

print "Content-type: text/plain; charset=iso-8859-1\n\n";
foreach my $var (sort(keys(%ENV))) {
    my $val = $ENV{$var};
    $val =~ s|\n|\\n|g;
    $val =~ s|"|\\"|g;
    print "${var}=\"${val}\"\n";
}