Feature Request: automatic https like Caddy

[kokizzu]

Title: automatic https like Caddy

Description:

Could envoy also implement something like this Caddy config:

x.com, www.x.com {
        root /home/web/x/public
        proxy / 127.0.0.1:8888 {
                header_upstream Host {host}
                header_upstream X-Real-IP {remote}
                header_upstream X-Forwarded-For {remote}
                header_upstream X-Forwarded-Proto {scheme}
        }
}

in Caddy, this would automatically fetch letsencrypt SSL/TLS certificates.

[mattklein123]

I believe this is a duplicate of #96

[kokizzu]

ah right, i'll follow that issue instead..