I am using nginx as a reverse proxy and am trying to log some variables set by apache to nginx log. So certain HTTP response headers are set by apache (PHP) and then I log them successfully with $sent_http_* variables.

But then I don't want the info to be exposed to outside world so I tried to remove them by adding "proxy_hide_header". What happened is that it actually makes the variables empty so nothing is logged properly. Is there any work-around for this? I want to remove the entries only for end users but I want to access them inside my nginx.