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failed: Unexpected response code: 502

appservice?t=1537006821587:5415 WebSocket connection to 'wss://www.xxx.com/' failed: Error during WebSocket handshake: Unexpected response code: 502


程序如下:

wx.connectSocket({  url: 'wss://example.qq.com',  data:{    x: '',    y: ''
  },  header:{ 
    'content-type': 'application/json'
  },  protocols: ['protocol1'],  method:"GET"})


这个问题如何处理?咋回事?

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