How to test a proxy with telnet

Lately I tried to test a proxy with telnet.
Here are the step I followed:

1. Open a telnet session
telnet www-proxy.oracleoutsourcing.com 80
2. Make the http request to the server you want to try
GET http://www.nfl.com HTTP/1.1
3. Give the host
host:www.nfl.com
(press enter twice)

This allow me to test our proxy from an environment we can only access through telnet.