transport=websocket' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED

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异常1：

transport=websocket' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED

这个原因是服务器没有开

异常2：

transport=websocket' failed: Error during WebSocket handshake: Unexpected response code: 400

WebSocket connection to 'ws://127.0.0.1:5000/socket.io/?EIO=3&transport=websocket' failed: Error during WebSocket handshake: Unexpected response code: 400

这个是服务器开了，握手失败：

原因：

不是这种方式：'transports': ['websocket']

解决：把 'transports': ['websocket']去掉就可以用了

var socket = io.connect( 'http://127.0.0.1:9000/warn/',
    {
        'sync disconnect on unload': true,
        'transports': ['websocket']
    });
    socket.on('connect', function() {
        alert("conn");
    socket.emit('alive', {
        data: 'ok'
    });
});

这种方法试了无效：

#加入wsgi中间件 app.wsgi_app = LighttpdCGIRootFix(app.wsgi_app) #启动flask io.run(app)