如何在nodejs Angular Universal web app上强制域名为https？

const https = require('https');
const http = require('http');
const fs = require('fs');

const options = {
  key: fs.readFileSync('private-key.pem'),
  cert: fs.readFileSync('certificate.pem')
};

// 创建HTTPS服务器
https.createServer(options, (req, res) => {
  res.writeHead(301, { 'Location': 'https://' + req.headers.host + req.url });
  res.end();
}).listen(443);

// 创建HTTP服务器并将请求重定向到HTTPS
http.createServer((req, res) => {
  res.writeHead(301, { 'Location': 'https://' + req.headers.host + req.url });
  res.end();
}).listen(80);

const express = require('express');
const https = require('https');
const fs = require('fs');

const app = express();
const options = {
  key: fs.readFileSync('private-key.pem'),
  cert: fs.readFileSync('certificate.pem')
};

// 中间件，将HTTP请求重定向到HTTPS
app.use((req, res, next) => {
  if (req.secure) {
    next();
  } else {
    res.redirect('https://' + req.headers.host + req.url);
  }
});

// 其他路由和处理程序
app.get('/', (req, res) => {
  res.send('Hello, HTTPS!');
});

// 创建HTTPS服务器
https.createServer(options, app).listen(443);

server {
  listen 80;
  server_name example.com;

  location / {
    return 301 https://$host$request_uri;
  }
}

server {
  listen 443 ssl;
  server_name example.com;

  ssl_certificate /path/to/certificate.pem;
  ssl_certificate_key /path/to/private-key.pem;

  # 其他配置项
  ...
}