nginx add_header not working

Question

I am having an intriguing problem where whenever I use add_header in my virtual host configuration on an ubuntu server running nginx with PHP and php-fpm it sim

Answer 1

It turns out that trying to update nginx to the newest version was causing this. I had tried previously to reinstall which seemed to reinstall it correctly but actually Ubuntu wasn't properly removing nginx. So all I had to do is reinstall Ubuntu server and install everything anew using just the standard ubuntu repositories.