Sci-Hub nginx reverse proxy setup

scihub-nginx.conf

# relevant parts of configuration
    upstream scihub {
        server 80.82.77.83:443;
        server 80.82.77.84:443;
    }

    server {
        listen       443 ssl http2;
        listen       [::]:443 ssl http2;
        server_name  sci-hub.yourdomain.comt;

        ssl_certificate      sci-hub-cert;
        ssl_certificate_key  sci-hub-key;

        ssl_session_cache    shared:SSL:1m;
        ssl_session_timeout  5m;

        ssl_ciphers  HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers  on;

        location / {
            proxy_pass https://scihub;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-Proto "";
            proxy_set_header X-Forwarded-Host $host;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_pass_request_headers on;
        }
    }
    server {
        listen       443 ssl http2;
        listen       [::]:443 ssl http2;
        server_name  ~^(?<subdomain>\w+)\.sci-hub\.yourdomain\.com$;
  
        ssl_certificate      sci-hub-cert;
        ssl_certificate_key  sci-hub-key;

        ssl_session_cache    shared:SSL:1m;
        ssl_session_timeout  5m;

        ssl_ciphers  HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers  on;

        location / {
            proxy_pass https://$subdomain.sci-hub.tw:443;
            proxy_http_version 1.1;
            proxy_set_header Host $subdomain.sci-hub.tw;
            proxy_set_header X-Forwarded-Proto "";
            proxy_set_header X-Forwarded-Host $host;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_pass_request_headers on;
            proxy_ssl_name $subdomain.sci-hub.tw;
            proxy_ssl_server_name on;
        }
    }