Socket.IO 失败：WebSocket 握手期间出错：意外的响应代码：400。

Question

我有一个托管在A2Hosting共享托管中的socket.io应用程序，问题是它仅使用xhr轮询，因为似乎存在错误建立套接字握手。

我收到的错误如下：

index.js:83 WebSocket connection to 'wss://www.xxxxxxx.com/socket.io/? 
EIO=3&transport=websocket&sid=7KqOx4VgE6xd507zAACf' failed: Error 
during WebSocket handshake: Unexpected response code: 400

app.js

var app = require('express')();
var server = require('http').Server(app);
var io = require('socket.io')(server);
const port = 65533

app.use(function(req, res, next) {
res.setHeader("Access-Control-Allow-Origin", 
"https://www.xxxxx.com/xxxx/xxxx");
res.setHeader("Access-Control-Allow-Credentials", true);
next();
});

server.listen(port, () => console.log(`Example app listening on port 
${port}!`));

app.get('/', (req, res) => res.send('Socket is running....'))

// io.set('transports', ['websocket']);

io.on('connection', function (socket) {
  socket.on('scan_complete', function (data) {
  io.emit("scan_result", data);
console.log(data);
});
});

针对app.js的.htaccess配置

RewriteEngine On
RewriteRule ^$ http://127.0.0.1:65533/ [P,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ http://127.0.0.1:65533/$1 [P,L]

客户端

$(function () {
        var socket = io.connect("https://www.xxxxx.com/");

        socket.on('scan_result', function (msg) {
            $('#content').html(profile);
        })

    })

- Rendell Lasola

Answer 1

这个对我有用：

    const io = require('socket.io')(server, {
      serveClient: false,
      // below are engine.IO options
      origins: '*:*',
      transports: ['polling'],  <== this is what solved my problem
      pingInterval: 10000,
      pingTimeout: 5000,
      cookie: false
    });

    io.on('connection', socket => {
      console.log('IO Connected!', socket.id);

      ...

      socket.on('disconnect', () => {
        console.log('User disconnected!', socket.id);
      });
    });

- lumisi

---

这对我也解决了问题。谢谢 @lumisi - Haresh Godhani

我认为你这样做实际上是完全禁用了WebSocket并使用了长轮询的备选方案，这比实际的WebSocket更繁琐和慢。在返回到仅使用轮询之前，应该先解决潜在问题。 - Tor

Answer 2

尝试在传输中添加websocket。

var socket = io(
                  'wss://www.xxxxx.com', 
                  { transports: ['websocket'] }
               );


socket.on('connect', function () {
  console.log('connected!');
  socket.emit('greet', { message: 'I am connected !' });
});

socket.on('scan_result', function (data) {
  console.log(data);
});

- Nishchit