微信小程序WebSocket报错：Error during WebSocket handshake: Sent non-empty 'Sec-WebSocket-Protocol' header but no response was received
2018-03-18 22:32
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Error during WebSocket handshake: Sent non-empty 'Sec-WebSocket-Protocol' header but no response was received
WebSocket握手阶段出错：发送了非空“Sec-WebSocket-Protocol”请求头但是响应中没有此字段
这个，在后端握手时设置一下请求头（Sec-WebSocket-Protocol）即可，前端发来什么值，这里就写什么值
测试：
在Chrome控制台输入 var ws = new WebSocket("ws:xx.xx.com","chat")，chat就是Sec-WebSocket-Protocol的值，协议名
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