我已经习惯了用Apache来做这些事情，而且我在用NGINX复制我想要的东西时遇到了问题，因为我对后者是新手。

我想要的：

Map/服务同一应用程序：

• api.domain1.com
• api.domain2.com
  我拥有的：

运行在Ubuntu 20.04上的Express应用程序& NGINX

• api.domain1.com-指向我的IP的记录
• api.domain1.com-为我的应用提供服务（运行良好）
• api.domain2.com-指向api.domain1.com的CNAME记录
• api.domain2.com-提供默认的Welcome to nginx!页面

我的问题
1.我是否必须为Map到我的应用程序的每个域创建一个“服务器块”？
1.我可以用一个服务器块文件处理多个（子）域吗A）还是B）每个（子）域都需要一个服务器块
在我的服务器块文件中，我有：
~/etc/nginx/sites-available/my_api

server {

        root /var/www/my_api/html;
        index index.html index.htm index.nginx-debian.html;

        server_name api.domain1.com www.api.domain1.com;

        location / {
            # try_files $uri $uri/ =404;
            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;
        }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/api.domain1.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/api.domain1.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}
server {
    if ($host = www.api.domain1.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    if ($host = api.domain1.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

        listen 80;
        listen [::]:80;

        server_name api.domain1.com www.api.domain1.com;
    return 404; # managed by Certbot



}