zrok/etc/caddy/multiple_upstream.Caddyfile

# Multiple Backends Example
#

# global config must be first
{
    # no listen on 2019/tcp with admin API
    admin off
}

# zrok site block
http:// {
    # Bind to the zrok share
    bind {{ .ZrokBindAddress }}

    # Handle paths starting with `/zrok/*`
    # This will also strip the `/zrok/` from the path before sending to the backend
    handle_path /zrok/* {
        reverse_proxy https://zrok.io {
            header_up Host zrok.io
        }
    }

    # serve index.html if it exists, else a file index
    handle_path /zrok-static/* {
        root * /var/www/html
        file_server browse
    }

    # All other traffic goes to localhost:3000
    reverse_proxy /* 127.0.0.1:3000 {
        header_up Host localhost:3000
        header_up X-Real-IP {http.request.header.x-forwarded-for}                                                          
    }
}