socket.io不适用于传输:['xhr-polling']

问题描述

我正在尝试在socket.io中测试回退到轮询，以验证我的应用程序可与出于任何原因不支持websocket的客户端一起使用.

I'm trying to test fallback to polling in socket.io, in order to verify that my app works with clients that don't support websockets for whatever reason.

我正在为Express 4使用非常基本服务器/客户端示例. >

I am using the very basic server/client example for Express 4. It works fine with:

// client-side
var options = {
   transports: [ 'xhr-polling', 'websocket' ]
};

var socket = io.connect('http://localhost:8080', options);
socket.on('news', function (data) {
  console.log(data);
  socket.emit('my other event', { my: 'data' });
});

但是，如果我从传输中删除"websocket"，则客户端上什么也不会发生-没有错误，没有事件，也没有任何事情.在服务器端，我只能看到:

However if I remove the 'websocket' from the transport, nothing happens on the client end- no error, no events, nothing. On the server side I see only:

Tue, 03 Mar 2015 16:45:49 GMT socket.io:server serve client 304

推荐答案

我突然打开源代码，发现socket.io.js现在正在检查字符串polling而不是xhr-polling.这样就可以了:

I popped open the source and found that socket.io.js is now checking for the string polling instead of xhr-polling. So this works:

var options = {
   transports: [ 'polling' ]
};

这篇关于socket.io不适用于传输:['xhr-polling']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！