Using Apache Environment Variables in .htaccess files with RewriteRule, SetEnvIf, Header, etc., is made easier by having a script that displays current variables and environment. Heres my slightly improved version of the common printenv and test-cgi scripts that come with Apache Installations.

Features of AskApache Environment Debugger

  • Only displays results for user-configured IP address
  • If IP is not allowed it will redirect to any page you specify.
  • Can also be run from the shell
  • Includes both built-in env and also uses perl

Example Output and Variables

printenv and test-cgi script

  • DOCUMENT_ROOT
  • GATEWAY_INTERFACE
  • HTTP_ACCEPT
  • HTTP_ACCEPT_CHARSET
  • HTTP_ACCEPT_ENCODING
  • HTTP_ACCEPT_LANGUAGE
  • HTTP_CACHE_CONTROL
  • HTTP_CONNECTION
  • HTTP_COOKIE
  • HTTP_HOST
  • HTTP_KEEP_ALIVE
  • HTTP_USER_AGENT
  • QUERY_STRING
  • REMOTE_ADDR
  • REMOTE_PORT
  • REQUEST_METHOD
  • REQUEST_URI
  • SCRIPT_FILENAME
  • SCRIPT_NAME
  • SCRIPT_URI
  • SCRIPT_URL
  • SERVER_ADDR
  • SERVER_ADMIN
  • SERVER_NAME
  • SERVER_PORT
  • SERVER_PROTOCOL
  • SERVER_SIGNATURE
  • SERVER_SOFTWARE

The Shell Script

Or Download

#!/bin/sh
###
### ASKAPACHE ENVIRONMENT DEBUGGER - Display Environment Variables using perl and builtin commands
### Version 1.0.2
###
### ---------------------------------------------------------------------------------------
### This work is licensed under the Creative Commons Attribution 3.0 United States License.
### To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/us/
### or send a letter to Creative Commons, 171 Second Street, Suite 300,
### San Francisco, California, 94105, USA.
### See http://www.askapache.com/about/disclaimer-and-license/ for info.
### ----------------------------------------------------------------------------------------
###
### Usage:
###
###   Place in public web directory request from your web browser.
###
###
### Install:
###
###   1. Place in public web directory like /cgi-bin/ and rename askapache-env.cgi
###   2. chmod 744 or chmod u+x
###   3. Add Options +ExecCGI to the top of /cgi-bin/.htaccess which should be chmod 644
###   4. Add your IP address to the MY_ALLOWED_IP variable in the config below (http://www.askapache.com/online-tools/whoami/)
###
###   Optionally you can add these lines to your .htaccess (http://www.askapache.com/htaccess/)
###   file to only allow from IP Address 208.113.183.103
###
###   Order Deny,Allow
###   Deny from All
###   Allow from 208.113.183.103

### CONFIGURATION
MY_ALLOWED_IP="208.113.183.103"
MY_REDIRECT="www.askapache.com"

# command line
if [ -e $GATEWAY_INTERFACE ]; then

echo "+ ARGS: ${0}"

echo "+-----------------------------------------------------+"
echo "| env                                                 |";
echo "+=====================================================+";
env | sort;echo;echo

echo "+-----------------------------------------------------+"
echo "| PERL PRINTENV                                       |";
echo "+=====================================================+";
perl -e'foreach $var (sort(keys(%ENV))) {$val = $ENV{$var};$val =~ s|n|\n|g;$val =~ s|"|\"|g;print "${var}="${val}"n"}';echo;echo

echo "+-----------------------------------------------------+"
echo "| declare                                             |";
echo "+=====================================================+";
declare | sort;echo;echo

else

if [ "$REMOTE_ADDR" == "$MY_ALLOWED_IP" ]; then

echo "Content-type: text/plain; charset=iso-8859-1";echo

echo "+ ARGS: ${0}"

echo "+-----------------------------------------------------+"
echo "| env                                                 |";
echo "+=====================================================+";
env | sort;echo;echo

echo "+-----------------------------------------------------+"
echo "| PERL PRINTENV                                       |";
echo "+=====================================================+";
perl -e'foreach $var (sort(keys(%ENV))) {$val = $ENV{$var};$val =~ s|n|\n|g;$val =~ s|"|\"|g;print "${var}="${val}"n"}';echo;echo

#echo "+-----------------------------------------------------+"
#echo "| declare                                             |";
#echo "+=====================================================+";
#declare | sort;echo;echo

else

echo "Content-type: text/html"
echo "Location: http://${MY_REDIRECT}";
echo "";

fi

fi

exit 0

Shell Scripting

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