Remote: Unhandled error

OS: BigSur 11.2.3
node v15.14.0

19:05:21  W2   info    Listen port 8001 in worker 2
19:05:21  W1   info    Listen port 8000 in worker 1
19:05:21  W3   info    Listen port 8002 in worker 3
19:05:21  W1   debug   Start example plugin
19:05:21  W1   debug   { set: { key: 'keyName', val: 100 } }
19:05:21  W1   debug   { get: 'keyName', return: 100 }
19:05:21  W1   debug   { res: 100, cache: undefined }
19:05:21  W1   debug   Connect to redis
19:05:21  W1   debug   Connect to pg
19:05:21  W1   warn    No redis service detected, so quit client
19:05:21  W1   debug   Connect to metacom
19:05:22  W5   error   Error [ERR_UNHANDLED_ERROR]: Unhandled error. (ErrorEvent {
  target: WebSocket {
    _events: [Object: null prototype] { message: [Function], error: [Array] },
    _eventsCount: 2,
    _maxListeners: undefined,
    _binaryType: 'nodebuffer',
    _closeCode: 1006,
    _closeFrameReceived: false,
    _closeFrameSent: false,
    _closeMessage: '',
    _closeTimer: null,
    _extensions: {},
    _protocol: '',
    _readyState: 2,
    _receiver: null,
    _sender: null,
    _socket: null,
    _bufferedAmount: 0,
    _isServer: false,
    _redirects: 0,
    _url: 'ws://localhost:8001',
    _req: ClientRequest {
      _events: [Object: null prototype],
      _eventsCount: 5,
      _maxListeners: undefined,
      outputData: [],
      outputSize: 0,
      writable: true,
      destroyed: true,
      _last: true,
      chunkedEncoding: false,
      shouldKeepAlive: true,
      _defaultKeepAlive: true,
      useChunkedEncodingByDefault: false,
      sendDate: false,
      _removedConnection: false,
      _removedContLen: false,
      _removedTE: false,
      _contentLength: 0,
      _hasBody: true,
      _trailer: '',
      finished: true,
      _headerSent: true,
      _closed: false,
      socket: [Socket],
      _header: 'GET / HTTP/1.1\r\n' +
        'Sec-WebSocket-Version: 13\r\n' +
        'Sec-WebSocket-Key: a3Nqj19jf3Be5inH15p34Q==\r\n' +
        'Connection: Upgrade\r\n' +
        'Upgrade: websocket\r\n' +
        'Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n' +
        'Host: localhost:8001\r\n' +
        '\r\n',
      _keepAliveTimeout: 0,
      _onPendingData: {},
      agent: undefined,
      socketPath: undefined,
      method: 'GET',
      maxHeaderSize: undefined,
      insecureHTTPParser: undefined,
      path: '/',
      _ended: false,
      res: [IncomingMessage],
      aborted: true,
      timeoutCb: null,
      upgradeOrConnect: false,
      parser: [HTTPParser],
      maxHeadersCount: null,
      reusedSocket: false,
      host: 'localhost',
      protocol: 'http:',
      [Symbol(kCapture)]: false,
      [Symbol(kNeedDrain)]: false,
      [Symbol(corked)]: 0,
      [Symbol(kOutHeaders)]: [Object: null prototype],
      [Symbol(kError)]: undefined
    },
    [Symbol(kCapture)]: false
  },
  type: 'error',
  message: 'Unexpected server response: 200',
  error: Error: Unexpected server response: 200
    ClientRequest.<anonymous> (/node_modules/ws/lib/websocket.js:604:7)
    ClientRequest.emit (node:events:369:20)
    HTTPParser.parserOnIncomingClient [as onIncoming] (node:_http_client:646:27)
    HTTPParser.parserOnHeadersComplete (node:_http_common:129:17)
    Socket.socketOnData (node:_http_client:512:22)
    Socket.emit (node:events:369:20)
    addChunk (node:internal/streams/readable:313:12)
    readableAddChunk (node:internal/streams/readable:288:9)
    Socket.Readable.push (node:internal/streams/readable:227:10)
    TCP.onStreamRead (node:internal/stream_base_commons:190:23)
})
  new NodeError (node:internal/errors:329:5)
  Metacom.emit (node:events:358:17)
  WebSocket.<anonymous> (/node_modules/metacom/lib/client.js:59:12)
  WebSocket.onError (/node_modules/ws/lib/event-target.js:140:16)
  WebSocket.emit (node:events:381:22)
  abortHandshake (/node_modules/ws/lib/websocket.js:722:15)
  ClientRequest.<anonymous> (/node_modules/ws/lib/websocket.js:604:7)
  ClientRequest.emit (node:events:369:20)
  HTTPParser.parserOnIncomingClient [as onIncoming] (node:_http_client:646:27)
  HTTPParser.parserOnHeadersComplete (node:_http_common:129:17)
user@MacBook-Air Example % 

Reproduce the report with macOS Big Sur, Node v15.14.0, and the logged services, then start in node_modules/metacom/lib/client.js and follow the WebSocket error path into ws/lib/websocket.js. Determine why the connection to ws://localhost:8001 receives HTTP 200 and triggers an unhandled error; done means the failure is handled or the connection succeeds without the reported exception.