NGINX仅传递来自主域的请求

Question

我当前的NGInx设置是这样，它将所有来自Http的请求都重定向到HTTPS，然后将请求传递给运行在Unbutu本地主机上的Node服务器。

我的追求是，如何做到这一点，使其仅接受来自app.domain.com（托管在其他位置）和api.domain.com（托管在Ubuntu云中）的请求。因此，如果您访问api.domain.com，则永远不会传递到Node服务器，或者如果您从app.domain.com之外的其他任何地方发送请求，您也永远不会传递到Node服务器。

server {
    listen 80;
    listen [::]:80 default_server ipv6only=on;
    return 301 https://$host$request_uri;
}

# HTTPS — proxy all requests to the Node app
server {
    # Enable HTTP/2
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name api.maindomain.com;

    # Use the Let’s Encrypt certificates
    ssl_certificate /etc/letsencrypt/live/api.maindomain.com/xxxx.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.maindomain.com/xxx.pem;

    # Include the SSL configuration from cipherli.st
    include snippets/ssl-params.conf;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://localhost:xxxx/;
        proxy_ssl_session_reuse off;
        proxy_set_header Host $http_host;
        proxy_cache_bypass $http_upgrade;
        proxy_redirect off;
    }
}