浏览器的本机 WebSocket 通过远程服务器在 onopen 事件 readyState 属性始终关闭

Question

在本地服务器上一切正常。但是，当我尝试通过Nginx在远程服务器上进行测试时，事件处理程序onopen中的readyState总是CLOSED。

Nginx配置：

server {
server_name    domain.domain;
access_log     /var/log/nginx/domain.domain.access.log;
error_log      /var/log/nginx/domain.domain.error.log;
location / {
proxy_connect_timeout 1d;
proxy_send_timeout 1d;
proxy_read_timeout 1d;
proxy_pass http://localhost:3001;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
proxy_set_header Host $host;
}
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/domain.domain/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/domain.domain/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
if ($host = domain.domain) {
return 301 https://$host$request_uri;
} # managed by Certbot

server_name    domain.domain;
listen 80;
return 404; # managed by Certbot

}

服务器示例代码：

import { WebSocketServer } from 'ws';
this.connection = new WebSocketServer(args, () => {
log('info', 'Server listen at port:', args.port, true);
});
this.connection.on('connection', (ws, req) => {
// Event is triggered fine 
console.log('Client connected');
})

客户样本代码：

const connection = new WebSocket(
'wss://domain.domain:443', 'json'
);
connection.onopen = () => {
// Event triggered bud connection.readyState is CLOSED every time
setInterval(() => {
console.log(connection.readyState);
}, 1000)
}
connection.onerror = () => {
// Never triggered
}
connection.onclose = () => {
// Never triggered
}

以前，使用相同服务器设置的相同代码运行良好。但过了一段时间，当我从备份中重新创建虚拟服务器时，出现了这样的问题，尽管其他一切都像以前一样工作。

Answer 1

再次查看我的代码，我发现自从上次成功测试以来，我向服务器添加了一个CORS检查，结果发现，该检查没有在环境变量中正确配置。

this.connection.on('connection', (ws, req) => {
// Event is triggered fine 
console.log('Client connected');
const { origin } = req.headers;
const notAllowed = process.env.CORS.split(',').indexOf(origin || '') === -1;
if (cors && notAllowed) {
log('warn', 'Block CORS attempt', { headers: req.headers });
ws.close();
return;
}
})

另一个问题是为什么客户端上没有触发事件onclose，以及为什么服务器上没有显示warn。但我认为，由于我在stdout中使用了一个特殊的方法输出，可能由于环境变量不正确，它也不起作用，但这是另一个问题——这里不需要考虑它。