HELP METEOR

upstream example {
        server 127.0.0.1:3000;
        server IP_FRONT2:3000 backup;
}

map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      close;
}

server {
        listen 80 default ;
        return 301 https://example.org$request_uri;
        server_name example.org;

        # HEADERS
        add_header X-Frame-Options SAMEORIGIN;
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";

        include /etc/nginx/includes/error_pages.conf;
        gzip on;

        location /RequestDenied {
                 return 418;
        }
        location  / {
            proxy_pass          http://example;
                proxy_redirect      off;
                proxy_set_header    Host              $http_host;
                proxy_set_header    X-Real-IP         $remote_addr;
                proxy_set_header    X-Forwarded-For   $proxy_add_x_forwarded_for;
                proxy_set_header    X-Forwarded-Proto $scheme;
                proxy_http_version  1.1;
                proxy_set_header    Upgrade           $http_upgrade;
                proxy_set_header    Connection        $connection_upgrade;
        }
}

server {
        listen 443 ssl http2 default;
        server_name example.org;

        ## Strong SSL Security
        include /etc/nginx/includes/ssl.conf;
        ssl_certificate /etc/nginx/ssl/mi.argentina.crt;
        ssl_certificate_key /etc/nginx/ssl/mi.argentina.key;
        ssl_client_certificate /etc/nginx/ssl/ca.crt;

        # HEADERS
        add_header X-Frame-Options SAMEORIGIN;
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";

        include /etc/nginx/includes/error_pages.conf;

        location /RequestDenied {
                 return 418;
        }

        access_log  /var/log/nginx/access.log;
        error_log   /var/log/nginx/error.log;

        location ~ (.htaccess|.htpasswd)$ {
            log_not_found off;
            access_log off;
            return 404;
        }
        location  / {
                proxy_pass          http://example;
                proxy_redirect      off;
                proxy_set_header    Host              $http_host;
                proxy_set_header    X-Real-IP         $remote_addr;
                proxy_set_header    X-Forwarded-For   $proxy_add_x_forwarded_for;
                proxy_set_header    X-Forwarded-Proto $scheme;
                proxy_http_version  1.1;
                proxy_set_header    Upgrade           $http_upgrade;
                proxy_set_header    Connection        $connection_upgrade;
        }
}