NGINX Cookbook

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While a server block for each named site to redirect works perfectly, we can easily convert this back into a generic server block. This way, it's a simple configuration file between different sites and ensures that all other virtual servers on the same system also redirect.

server { 
    listen 80 default_server; 
    server_name  _; 
    return 301 https://$server_name$request_uri; 
} 

Set default_server to the server block of any undefined server. The underscore (_) is simply a placeholder in NGINX; because we've set this server block to be the default, it will process all non-matching requests anyway. The underscore simply makes it easy to view.