Maybe stupid question but can HAProxy now use a upstream proxy

[Aleksandar Lazic]

Hi.

I follow the development more or less closely and I must say I not always 
understand all changes :-).

Just for my clarification is the following setup now possible with HAProxy with 
all the new shiny features  :-)

client => frontend
              |
              \-> backend server dest1 IP:port
                    |
                    \-> call "CONNECT IP:PORT" on upstream proxy
                          |
                          \-> TCP FLOW to destination IP


I know there is the http://docs.haproxy.org/2.9/configuration.html#5.2-socks4 
option but sadly not too much enterprise Proxies admins offers socks4 nowadays.

I think the Scenario is still not possible but I would like to have a second eye 
opinion on that.

Maybe somebody on the list have a working solution for the scenario and can 
share it, maybe only via direct mail. ¯\_(ツ)_/¯

Regards
Alex