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httptunnel 3.3 (binary only) - DEPRECATED⚓︎

httptunnel
creates a virtual, bidirectional data connection tunneled over the HTTP
protocol. The required HTTP requests can also be routed through proxies
if needed.

This approach is useful for anyone behind a restrictive firewall. As long
as web access is allowed, even if only through a proxy, httptunnel can
be used, for example, to access a computer outside the firewall via
Telnet.

A somewhat more illustrative example follows, by
sweetie-pie
from this
Thread:

PC at the company        Proxy at the company       Fritzbox

    +-------+    Connected to                        +-------+    home network
   |Putty  |--+ 127.0.0.1:22                        |sshd   |--> via ssh-Tunnel
   |-------|  |                +-----+              |       |<-+ (Port 22)
   |htc    |<-+ Port 22        |HTTP |              |-------|  |
   |       |------------------>|Proxy|------------->|hts    |--+
   +-------+                   +-----+    Port 9999 +-------+

Currently, httptunnel is available for Freetz only as a binary (3.3), so
there is no WebGUI for graphical settings yet.