I'm writing a PHP application, located on Linux (Ubuntu, whether it matters), and I wish to have the ability to install an SSL cert quickly for subdomains without interfering with service by restarting the net server. All documentation I'm able to find for Apache indicates restarting it once the cert is installed, so Apache is probably not the answer. I am prepared to get a different server, for example Nginx, in the event that will have the ability to do that.