让 ExpresJS 处理 SSL 证书和 NginX 转发端口

如何解决让 ExpresJS 处理 SSL 证书和 NginX 转发端口

我在端口 8443 上有一个 Expressjs HTTPS 服务器列表，我想使用 Nginx 将 443 请求转发到我的 https 服务器。

    const fs = require('fs');
    const key = fs.readFileSync('/etc/letsencrypt/live/example.com/privkey.pem','utf8');
    const cert = fs.readFileSync('/etc/letsencrypt/live/example.com/cert.pem','utf8');

    const credentials = { key,cert };

    const httpsServer = require('https').createServer(credentials,app);
    httpsServer.listen(8443);

Nginx 配置：

server {
       listen 443;
        server_name example.com;

        location / {
                proxy_pass http://localhost:8443;
                proxy_http_version  1.1;
                proxy_set_header    Upgrade $http_upgrade;
                proxy_set_header    Connection "upgrade";
                proxy_set_header    Host $http_host;
                proxy_set_header    X-Real-IP $remote_addr;
                proxy_read_timeout 86400;
        }
}

但是当我访问 https://example.com 时，页面刚刚损坏。我做错了什么？