server behind nat

How to access a Linux server behind NAT via reverse SSH tunnel
autossh in background does not work

https://superuser.com/questions/121435/is-it-possible-to-host-a-web-server-from-behind-a-nat

https://en.wikipedia.org/wiki/HTTP_tunnel#HTTP_CONNECT_tunneling

Tunnel

GNU HTTPtunnel v3.3 Windows Binaries
https://daniel.haxx.se/docs/sshproxy.html
Punching holes into firewalls
HTTP Tunnel
http://http-tunnel.sourceforge.net
https://github.com/larsbrinkhoff/httptunnel
https://en.wikipedia.org/wiki/HTTP_tunnel
https://en.wikipedia.org/wiki/BOSH_(protocol))
Web-proxy with Tinyproxy and ssh-tunnel

https://github.com/proxytunnel/proxytunnel

https://askubuntu.com/questions/107173/is-it-possible-to-ssh-through-port-80
https://serverfault.com/questions/734808/reach-server-via-ssh-tunnel-and-nginx-proxy
https://askubuntu.com/questions/107173/is-it-possible-to-ssh-through-port-80
Nginx configuration for SSH tunnel
https://www.ssh.com/ssh/tunneling/example

https://anands.github.io/blog/2015/11/03/using-reverse-ssh-tunneling-to-expose-services-on-private-networks-to-public-internet/
https://stackoverflow.com/questions/12845595/trouble-ssh-tunneling-to-remote-server
https://stackoverflow.com/questions/16838588/how-to-make-apache-recognize-domain-when-connecting-through-ssh-tunnel
https://www.linuxquestions.org/questions/linux-server-73/ssh-tunnel-to-web-site-behind-nginx-proxy-4175492868/
https://sebastian.korotkiewicz.eu/2016/10/09/nginx-configuration-for-ssh-tunnel/

Stunnel

How To Set Up an SSL Tunnel Using Stunnel on Ubuntu

PHP Proxy

https://www.php-proxy.com/
https://github.com/Athlon1600/php-proxy-app
https://github.com/365cent/365

verything you need to know to Build a simple HTTP server from scratch

https://medium.com/from-the-scratch/http-server-what-do-you-need-to-know-to-build-a-simple-http-server-from-scratch-d1ef8945e4fa