With ISPconfig 3.x and NginX, a powerful server is at your fingertips! One question though, to help some understand nginx configuration: What is the difference... Putting code under server{} in sites-available/your-site.vhost? or Putting code under http{} in the nginx.conf file?
I think the later should be the server level while the former is domain level. Try reading the following about the later structure in nginx: https://www.digitalocean.com/commun...ion-file-structure-and-configuration-contexts