nginx.conf

user root root; # change this!
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events{
    worker_connections 1024;
}

http{
    upstream node_backend {
        least_conn;
        server 127.0.0.1:8888; # change port here
        # more can be specified if you want faster proxying (I tested it. It will not result in huge performance gains)
        #server 127.0.0.1:8889;
    }
    
    
    resolver 1.1.1.1;
    proxy_cache_path /tmp/nginx-cache levels=1:2 keys_zone=diepcache:10m max_size=1g inactive=120m use_temp_path=off;
    
    map $http_upgrade $prox_upgrade {
        default upgrade;
        '' close;
    }
    
    map $http_upgrade $prox_url {
        default $protocol://$targetURL:$prox_port;
        '' http://node_backend;
    }
    map $http_upgrade $prox_host {
        default $proxy_host;
        '' $host;
    }
    map $http_upgrade $prox_origin {
        default $targetOrigin;
        '' $http_origin;
    }
    map $http_upgrade $prox_referer {
        default $targetReferer;
        '' $http_referer;
    }
    
    map $issecure $protocol {
        default 'http';
        's' 'https';
    }
    map "$issecure:$requestport" $prox_port {
        default $requestport;
        's:' 443;
        'ns:' 80;
    }
    
    server{
        # https://securePORT--google--com.proxy.site
        server_name ~^(?<issecure>s|ns)(?<requestport>[\d]*)--(?<subdomain>.+)\.(?<domain>.+)\.(?<extension>.+);
        listen 80;
        merge_slashes off;
        proxy_ssl_server_name on;
        proxy_ssl_session_reuse off;
        
        proxy_buffer_size 128k; # required in case a proxying URL or a client has a big header to send.
        proxy_buffers 4 256k;
        proxy_busy_buffers_size 256k;
        
        location / {
            proxy_set_header Accept-Encoding "";
            proxy_http_version 1.1;
            
            # remember that these variables are only used for websocket requests
            set $targetURL "";
            set $targetOrigin "";
            set $targetReferer "";
            
            access_by_lua_block {
                ngx.var.targetURL = ngx.var.subdomain:gsub('([^_])%-%-', '%1%.'):gsub('_%-', '%-')
                if ngx.var.http_upgrade and ngx.var.http_upgrade ~= '' then
                    if ngx.var.http_origin and ngx.var.http_origin ~= '' then
                        ngx.var.targetOrigin = ngx.var.http_origin:gsub('([^.]+).[^.]+.[^.]+', '%1'):gsub('(://)s[0-9]*%-%-', '://'):gsub('([^_])%-%-', '%1%.'):gsub('_%-', '%-')
                    end
                    if ngx.var.http_referer and ngx.var.http_referer ~= '' then
                        ngx.var.targetReferer = ngx.var.http_referer:gsub('([^.]+).[^.]+.[^.]+', '%1'):gsub('(://)s[0-9]*%-%-', '://'):gsub('([^_])%-%-', '%1%.'):gsub('_%-', '%-')
                    end
                end
            }
            
            proxy_set_header Host $prox_host;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $prox_upgrade;
            
            proxy_set_header Origin $prox_origin;
            proxy_set_header Referer $prox_referer;
            
            proxy_pass $prox_url;
        }
    }
    server{ # capture all that doesn't match the server_name
        server_name _;
        listen 80 default_server;
        merge_slashes off;
        proxy_ssl_server_name on;
        proxy_ssl_session_reuse off;
        
        location / {
            proxy_set_header Accept-Encoding "";
            proxy_set_header Host $host;
            
            proxy_pass http://node_backend;
        }
    }
}