我正在尝试通过create-next-app部署一个next-js应用，我有一个像这样的自定义express服务器-

const express = require('express')
const next = require('next')
const dev = process.env.NODE_ENV !== 'production'
const nextApp = next({ dev })
const handle = nextApp.getRequestHandler()

const fs = require('fs')

nextApp.prepare()
.then(() => {
    const server = express ()

    let port = 3000;

    let options = {
        key: fs.readFileSync('some key..', 'utf-8'),
        cert: fs.readFileSync('some cert..', 'utf-8'),
    };

    server.get(
        ...
    )

    let app = https.createServer(options, server)
    .listen((port), function(){
    console.log("Express server listening on port " + port);
    });

})
.catch((ex) => {
    console.error(ex.stack)
    process.exit(1)
})

我想把它部署为网站，当有人输入网址subdomain.maindomain.com时，所以我保存了两个nginx配置文件，如下所示-

/etc/nginx/sites-available/default和**/etc/nginx/sites-available/subdomain.maindomain.com**

默认文件包含以下内容

server {

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

    server_name maindomain.com www.maindomain.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/maindomain.com/fullchain.pem;$
    ssl_certificate_key /etc/letsencrypt/live/maindomain.com/privkey.pe$
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

subdomain.maindomain.com文件如下所示

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

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

    listen 80;
    listen [::]:80;

    root /var/www/subdomain.maindomain.com/somecodefolder/;
    index index.html index.htm index.nginx-debian.html;

    server_name subdomain.maindomain.com www.subdomain.maindomain.com;

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

}
如果我输入https://subdomain.maindomain.com:3000，一切正常，我看到我的网站运行.但当我输入https://subdomain.maindomain.com（没有端口号）它什么也没显示.我怎么能得到我想要的内容时，我只输入网址没有端口号.我已经尝试了许多组合，但'nt做.有人请帮助我一直在努力，因为2天.