Custom NGINX 503 Page

503.nginx

server {
    server_name _;
    
    # override how 503's should be handled
    error_page 503 @503;

    location @503 {
        # attempt to server our custom 503 first
        # then fall back to the built-in one
        try_files /503.html =503;
    }
    
    #location /make/this/path/503 {
    #  return 503;
    #}
    
    # or, 503 everything
    #return 503;
}