Missing error handler on `socket`. when using node.js v0.12

[smartmouse]

:˜/test/socket.io$ npm test

socket.io@1.3.2 test /home/test/socket.io
mocha --reporter dot --slow 200ms --bail

child_process: customFds option is deprecated, use stdio instead.

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Missing error handler on socket.
Error: Illegal attachments
at decodeString (/home/test/socket.io/node_modules/socket.io-parser/index.js:290:13)
at Decoder.add (/home/test/socket.io/node_modules/socket.io-parser/index.js:238:14)
at Client.ondata (/home/test/socket.io/lib/client.js:176:18)
at Socket.emit (events.js:107:17)
at Socket.onPacket (/home/test/socket.io/node_modules/engine.io/lib/socket.js:99:14)
at WebSocket.emit (events.js:129:20)
at WebSocket.Transport.onPacket (/home/test/socket.io/node_modules/engine.io/lib/transport.js:91:8)
at WebSocket.Transport.onData (/home/socket.io/node_modules/engine.io/lib/transport.js:102:8)
at WebSocket.onData (/home/socket.io/node_modules/engine.io/lib/transports/websocket.js:75:30)
at WebSocket.emit (events.js:110:17)
at Receiver.ontext (/home/socket.io/node_modules/engine.io/node_modules/ws/lib/WebSocket.js:798:10)
at /home/socket.io/node_modules/engine.io/node_modules/ws/lib/Receiver.js:473:18
at /home/test/socket.io/node_modules/engine.io/node_modules/ws/lib/Receiver.js:357:7
at /home/test/socket.io/node_modules/engine.io/node_modules/ws/lib/PerMessageDeflate.js:217:5
at afterWrite (_stream_writable.js:361:3)
at onwrite (_stream_writable.js:352:7)
at WritableState.onwrite (_stream_writable.js:105:5)

[smartmouse]

still the same issue --for socket.io@1.3.6 node version is 0.12.7

socket.io@1.3.6 test /home/nodebot/test/socket.io
mocha --reporter dot --slow 200ms --bail

child_process: customFds option is deprecated, use stdio instead.

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․․․․․․․․․․․․․․․․․․․․․․․․․․․․․Note: warning expected and normal in test.
Missing error handler on socket.
Error: Illegal attachments
at decodeString (/home/nodebot/test/socket.io/node_modules/socket.io-parser/index.js:290:13)
at Decoder.add (/home/nodebot/test/socket.io/node_modules/socket.io-parser/index.js:238:14)
at Client.ondata (/home/nodebot/test/socket.io/lib/client.js:175:18)
at Socket.emit (events.js:107:17)
at Socket.onPacket (/home/nodebot/test/socket.io/node_modules/engine.io/lib/socket.js:101:14)
at WebSocket.emit (events.js:107:17)
at WebSocket.Transport.onPacket (/home/nodebot/test/socket.io/node_modules/engine.io/lib/transport.js:93:8)
at WebSocket.Transport.onData (/home/nodebot/test/socket.io/node_modules/engine.io/lib/transport.js:104:8)
at WebSocket.onData (/home/nodebot/test/socket.io/node_modules/engine.io/lib/transports/websocket.js:75:30)
at WebSocket.emit (events.js:110:17)
at Receiver.ontext (/home/nodebot/test/socket.io/node_modules/engine.io/node_modules/ws/lib/WebSocket.js:797:10)
at /home/nodebot/test/socket.io/node_modules/engine.io/node_modules/ws/lib/Receiver.js:473:18
at /home/nodebot/test/socket.io/node_modules/engine.io/node_modules/ws/lib/Receiver.js:357:7
at /home/nodebot/test/socket.io/node_modules/engine.io/node_modules/ws/lib/PerMessageDeflate.js:217:5
at afterWrite (_stream_writable.js:361:3)
at onwrite (_stream_writable.js:352:7)
at WritableState.onwrite (_stream_writable.js:105:5)
at afterTransform (_stream_transform.js:99:5)
at TransformState.afterTransform (_stream_transform.js:74:12)
at Zlib.callback (zlib.js:611:5)
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107 passing (14s)

[darrachequesne]

That issue was closed automatically. Please check if your issue is fixed with the latest release, and reopen if needed (with a fiddle reproducing the issue if possible).

[Novivy]

This is still happening on node v12.18.2, what could cause this? bad payload from client?

[darrachequesne]

@Novivy yes, this could indeed be caused by a bad payload from the client:

socket.io/lib/client.ts

Lines 296 to 301 in 9b43c91

	private onerror(err): void {
	for (const socket of this.sockets.values()) {
	socket._onerror(err);
	}
	this.conn.close();
	}

[Novivy]

@Novivy yes, this could indeed be caused by a bad payload from the client:

socket.io/lib/client.ts

Lines 296 to 301 in 9b43c91

	private onerror(err): void {
	for (const socket of this.sockets.values()) {
	socket._onerror(err);
	}
	this.conn.close();
	}

any suggestions to PR this?

[darrachequesne]

For now, I think you can add an empty error handler:

socket.on("error", () => {});

We will remove this in the next major version, as this does not provide much value (the socket is disconnect in any case).

[darrachequesne]

For future readers:

The warning was silenced in 15af22f, included in version 4.6.2.