VPS 服务器给出 404. React

我在这个问题上完全是菜鸟，但我真的很想部署我的工作。

MERN 堆栈中有一个应用程序。（蒙戈，快递，反应，节点）

我使用 nginx 使用简短指令设置了 ubuntu 上的 VPS 服务器：
https ://github.com/yestellar/deploy-node-nginx-ssl

服务器由Jino 提供。

在根目录中，我有 2 个文件夹：客户端和服务器，我实际上在其中克隆了必要的存储库。在服务器文件夹中，我克隆了节点服务器并启动它，控制台中显示一条消息，说明一切正常。然后，使用 pm2，我使用上面链接中文章中的命令启动了客户端。

NODE_ENV=production pm2 start npm --name strapi -- run start # Запустить в режиме продакшн npm run start скрипт и назвать "strapi"

状态显示“正常”

一般来说，在任何地方，所有状态都可以：nginx、node、npm、mongo……但该站点给出了 404。

我尝试了不同的设置和代理，/etc/nginx/sites-available/default 但它不起作用

怎么修？我将非常感谢任何信息。

这是代码/etc/nginx/sites-available/default ：

PS带有return的行被注释掉了，因为 无休止的重定向，首先您需要至少使 http 工作，然后我将处理 https。

server {
   # listen [::]:443 ssl default_server;
    #
    # Note: You should disable gzip for SSL traffic.
    # See: https://bugs.debian.org/773332
    #
    # Read up on ssl_ciphers to ensure a secure configuration.
    # See: https://bugs.debian.org/765782
    #
    # Self signed certs generated by the ssl-cert package
    # Don't use them in a production server!
    #
    # include snippets/snakeoil.conf;

    root /var/www/html;

    # Add index.php to the list if you are using PHP
    index index.html index.htm index.nginx-debian.html;

    server_name site-name.ru  www.site-name.ru;

location / {
    proxy_pass http://localhost:3000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
        proxy_redirect off;
}

        # pass PHP scripts to FastCGI server
        #
        #location ~ \.php$ {
        #       include snippets/fastcgi-php.conf;
        #
        #       # With php-fpm (or other unix sockets):
        #       fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        #       # With php-cgi (or other tcp sockets):

            #       fastcgi_pass 127.0.0.1:9000;
            #}
    
            # deny access to .htaccess files, if Apache's document root
            # concurs with nginx's one
            #
            #location ~ /\.ht {
            #       deny all;
            #}
    
        listen [::]:443 ssl ipv6only=on; # managed by Certbot
        listen 443 ssl; # managed by Certbot
        ssl_certificate /etc/letsencrypt/live/site-name.ru/fullchain.pem; # man>
        ssl_certificate_key /etc/letsencrypt/live/site-name.ru/privkey.pem; # m>
        include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
        ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
    
    
    }
    
    #
    #server {
    #       listen 80;
    #       listen [::]:80;
    #
    #       server_name example.com;
    #
    #       root /var/www/example.com;
    #       index index.html;
    #
    #       location / {
    #               try_files $uri $uri/ =404;
    #       }
    #}
    
    server {
        if ($host = www.site-name.ru) {
           # return 301 https://$host$request_uri;
        } # managed by Certbot
    
    
        if ($host = site-name.ru) {
            #return 301 https://$host$request_uri;
        } # managed by Certbot
    
    
            listen 80 default_server;
            listen [::]:80 default_server;
    
            server_name site-name.ru www.site-name.ru;
        return 404; # managed by Certbot
    }