kris@valiant:~/www <   cat urlencode.php
#! /home/kris/bin/php -q
<  ?php
  print urlencode($argv[1])."n";
? >
kris@valiant:~/www <   ./urlencode.php "this is a test"
this+is+a+test

kris@valiant:~/www <   telnet valiant 80
Trying 193.102.57.3...
Connected to valiant.koehntopp.de.
Escape character is '^]'.
POST /~kris/test.php HTTP/1.0
Host: valiant.koehntopp.de
Referer: http://www.attacker.com/die_sucker_die.html
Content-Type: application/x-www-form-urlencoded
Content-Length: 16

b=this+is+a+test
HTTP/1.1 200 OK
Date: Sat, 08 Apr 2000 06:55:11 GMT
Server: Apache/1.3.9 (Unix)  (SuSE/Linux) PHP/4.0RC2-dev
mod_ssl/2.4.7 OpenSSL/0.9.4
X-Powered-By: PHP/4.0RC2-dev
Connection: close
Content-Type: text/html

The value of b is this is a test
The value of HTTP_REFERER is
http://www.attacker.com/die_sucker_die.html
Connection closed by foreign host.