Use haproxy as a reverse proxy with an application behind Internet proxy

I was intrigued to make it work but i really could not find anything in the haproxy documentation, so i googled a bit and found that nginx might do the trick, but it didn't for me, after a bit more of googleing i ended up finding a configuration for apache that works.

here is the important part:

Listen 80

SSLProxyEngine on

ProxyPass /example/ https://www.example.com/
ProxyPassReverse /example/ https://www.example.com/
ProxyRemote https://www.example.com/ http://corporateproxy:port

ProxyPass /google/ https://www.google.com/
ProxyPassReverse /google/ https://www.google.com/
ProxyRemote https://www.google.com/ http://corporateproxy:port

i'm quite sure there should be a way to translate this configuration to nginx and even to haproxy... if i manage to find the time i will update the answer with my findings.

for apache to work you should also enable a few modules, i put up a github repository with a basic docker configuration that showcases feel free to have a look at that to see the full working configuration.

How about to use delegate ( http://delegate.org/documents/ ) for this, just as an idea.

haproxy -> delegate -f -vv -P127.0.0.1:8081 PROXY=<your-proxy>

http://delegate9.org/delegate/Manual.shtml?PROXY

I know it's not that elegant but it could work.

I have tested this setup with a local squid and this curl call

echo 'GET http://www.php.net/' |curl -v telnet://127.0.0.1:8081

The curl call simluates the haproxy tcp call.