HTTPTunnel is a tunneling software that can tunnel network connections through restrictive HTTP proxies over pure HTTP “GET” and “POST” requests.
Creates a bidirectional virtual data stream tunnelled in HTTP requests. The requests can be sent via a HTTP proxy if so desired. This can be useful for users behind restrictive firewalls. If WWW access is allowed through a HTTP proxy, it’s possible to use httptunnel and, say, telnet or PPP to connect to a computer outside the firewall.