I have just checked and the nginx directive "proxy_set_header" does NOT append a value, it replaces. It will only be added to the existing value if you set it t

I have just checked and the nginx directive "proxy_set_header" does NOT append a value, it replaces. It will only be added to the existing value if you set it to `$proxy_add_x_forwarded_for` instead of `$remote_addr`.