u2nl (u-tunnel, universal tunnel) is a small
application that listens on a TCP port and
tunnels all connections transparently via an HTTPS
proxy (using the CONNECT command) to the Internet.
Another host on the Internet is not needed. This
only works if the HTTPS proxy allows these CONNECT
connections. It can be used to provide a Linux
host with full connectivity when everything except
the http proxy is blocked by a firewall.
