CGI Environment variables

The Common Gateway Interface runs an external program (a 'CGI script') as a result of a client request and returns the output of the program to the client. CGI defines the interface between the web server and the CGI script.

Useful references:

• http://hoohoo.ncsa.uiuc.edu/cgi/
• http://www.perl.org/
• http://www.w3.org/

#!/usr/bin/perl

print STDOUT <<HERE;
Content-Type: text/plain
Status: 200 OK

Some Environment Variables:

The server host name is: $ENV{SERVER_NAME}
and the client is : $ENV{HTTP_USER_AGENT}
HERE

This script produces output like:

Some Environment Variables:

The server host name is : digital.zeus.com
and the client is : Mozilla/4.01 [en] (WinNT; I)

Content Manager [Administrator] 16 December 2005