SSL Passthrough

[agforte]

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I have found the problem. It was actually a code issue. I am using Golang.
The problem was that I was configuring the Proxy as:

*httpsCl = http.Client{
       Transport: &http.Transport{
            Proxy: http.ProxyURL(proxyUrl),
            TLSClientConfig: tlsConfig
       },
}
and in doing so the private server was expecting to talk to the Proxy which
does not work if we are using SSL passthrough. Instead I had to configure
the proxy as:

*httpsCl = http.Client{
                Transport: &http.Transport{
                        Dial: func(network, addr string) (net.Conn, error){
                                   return net.Dial("tcp", proxyUrl.Host)
                              },
                        TLSClientConfig: tlsConfig
                },
}
Thanks all!

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,272487,272493#msg-272493