How to interpret error messge

[aeolus]

Hi, our service recently throws a websocket exception from time to time. The error itself is like this:

Invalid WebSocket frame: invalid payload length 126

Now I manage to print the error as a json. My question is there any way to interpret this error message. The buffers array looks like a decimal array to me but I failed to decode it to any useful context and I don't know what the usage for mask here.
{
"target": {
"_events": {
"close": [null, null]
},
"_eventsCount": 3,
"readyState": 2,
"protocol": "",
"_binaryType": "nodebuffer",
"_closeFrameReceived": false,
"_closeFrameSent": false,
"_closeMessage": "",
"_closeTimer": null,
"_closeCode": 1002,
"_extensions": {},
"_receiver": {
"_writableState": {
"objectMode": false,
"highWaterMark": 16384,
"finalCalled": false,
"needDrain": false,
"ending": false,
"ended": false,
"finished": false,
"destroyed": false,
"decodeStrings": true,
"defaultEncoding": "utf8",
"length": 0,
"writing": false,
"corked": 0,
"sync": true,
"bufferProcessing": false,
"writecb": null,
"writelen": 0,
"bufferedRequest": null,
"lastBufferedRequest": null,
"pendingcb": 0,
"prefinished": false,
"errorEmitted": true,
"emitClose": true,
"autoDestroy": false,
"bufferedRequestCount": 0,
"corkedRequestsFree": {
"next": null,
"entry": null
}
},
"writable": true,
"_events": {},
"_eventsCount": 6,
"_binaryType": "nodebuffer",
"_extensions": {},
"_maxPayload": 104857600,
"_bufferedBytes": 1440,
"_buffers": [{
"type": "Buffer",
"data": [some_data]
}],
"_compressed": false,
"_payloadLength": 126,
"_mask": {
"type": "Buffer",
"data": [40, 116, 54, 115]
},
"_fragmented": 0,
"_masked": true,
"_fin": true,
"_opcode": 10,
"_totalPayloadLength": 0,
"_messageLength": 0,
"_fragments": [],
"_state": 0,
"_loop": false
},
"_sender": {

If anybody know what migtht cause this error would be nice as well.

[lpinca]

Hi,
you get this error when the "payload length" of a control frame (ping, pong, or close) has a value bigger than 125. All control frames must have a payload length of 125 bytes or less.

See https://tools.ietf.org/html/rfc6455#section-5.2 and https://tools.ietf.org/html/rfc6455#section-5.5 for more info.

[lpinca]

You can reproduce with the following code:

const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 8080 }, function() {
  const ws = new WebSocket('ws://localhost:8080');

  ws.on('open', function() {
    ws._socket.write(Buffer.from([0x89, 0xfe]));
  });
});

wss.on('connection', function(ws) {
  ws.on('error', console.error);
});