socket.io，“访问控制允许来源”错误 [英] socket.io, 'Access-Control-Allow-Origin' error

问题描述

我已经设置了一个节点服务器，并打开了io套接字，并尝试通过另一台服务器连接到它。
但是，不同计算机上的某些浏览器却给我这个错误，并使它始终重新连接：

I have set up a node server with socket io turning and trying to connect to it through another server. However some browsers on different computers give me this error and makes it reconnect the whole time:

XMLHttpRequest无法加载 https://serverDomain.net:3000/socket.io/?EIO=3&transport= polling& t = Lo_SdiU 。当请求的凭据模式为包括时，响应中访问控制允许来源标头的值不能为通配符 *。因此，不允许访问来源‘ https://www.differentServerDomain.fr 。 XMLHttpRequest发起的请求的凭据模式由withCredentials属性控制。

XMLHttpRequest cannot load https://serverDomain.net:3000/socket.io/?EIO=3&transport=polling&t=Lo_SdiU. The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. Origin 'https://www.differentServerDomain.fr' is therefore not allowed access. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.

我的js配置：

var port = 3000;
var fs = require('fs');
var https = require('https');
var express = require('express');
var app = express();

var options = {
    key: fs.readFileSync('/etc/letsencrypt/live/devpeter.net/privkey.pem'),
    cert: fs.readFileSync('/etc/letsencrypt/live/devpeter.net/fullchain.pem')
};
var server = https.createServer(options, app);
var io = require('socket.io')(server);
io.origins('https://www.differentServerDomain.fr:* https://www.differentServerDomain.fr/wp-admin/index.php:*');

// start of server
server.listen(port, function(){
    console.log('listening on *: '+ port + "\n");
});

我正在使用节点8.0和套接字io 2.2，
我们将不胜感激。

I am using node 8.0 and socket io 2.2, Your help will be greatly appreciated.

编辑：
这是客户端代码：

here is the client code:

<script src="https://serverDomain.net:3000/socket.io/socket.io.js"></script>
<script>
   var socket = io('https://serverDomain.net:3000');
</script>

推荐答案

我找到了解决方案。
由于某种原因，并非所有服务器都始终允许使用默认的运输方式。

i have found a solution. for some reason the default transportation method is not always allowed by all servers.

所以我在客户端指定了中立的运输方式，例如：

so i specified a neutral transportation method at the client side, like so:

var socket = io('https://yourDomain:3000', { transport : ['websocket'] });

这篇关于socket.io，“访问控制允许来源”错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！