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closeOnBeforeunload not working properly after upgrading to socketio v4.7.5#5055

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With following configuration
this.socket = io({
closeOnBeforeunload: false,
reconnection: true,
reconnectionDelay: 100,
reconnectionDelayMax: 2000,
reconnectionAttempts: Infinity,
transports: ["polling"],
secure: true,
rejectUnauthorized: false,
forceNew: false,
timeout: 6000,
})

when I try to leave the page on Firefox the socket connection is disconnected and if I try to log the reason for disconnection it says "transport error "

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Hi! When settingcloseOnBeforeunload: false, the Socket instance will indeed emit adisconnect event when the user reloads the page on Firefox.

Reference:https://socket.io/docs/v4/client-options/#closeonbeforeunload

Replies: 3 comments 1 reply

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@darrachequesne can you provide any input here?

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0 replies
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Hi! When settingcloseOnBeforeunload: false, the Socket instance will indeed emit adisconnect event when the user reloads the page on Firefox.

Reference:https://socket.io/docs/v4/client-options/#closeonbeforeunload

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Answer selected bydarrachequesne
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But if I set it to true is silently closes the transport and I am unable to emit any event.
Basically what I want to do is that on javascript "beforeUnload" event I want to emit a socket event it works fine on chrome and other browsers but on firefox no event is being fired.

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1 reply
@darrachequesne
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I was not able to reproduce the issue:https://github.com/socketio/socket.io-fiddle/tree/socket.io/discussions/5055

$ node server.jsserver listening at http://localhost:3000connect NyI3hlDYDpKmSbt9AAABreceived 'bye'disconnect NyI3hlDYDpKmSbt9AAAB due to transport closeconnect 38pAi8rwORkfnrbPAAADreceived 'bye'disconnect 38pAi8rwORkfnrbPAAAD due to transport closeconnect jxE3dn1g6Stpb-ZNAAAH

Thebeforeunload handler:

window.addEventListener("beforeunload",()=>{console.log("beforeunload");socket.emit("bye");});

Same behavior on Chromium (v123) and Firefox (v127) on Ubuntu 22.04.

Am I missing something?

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@sarmad36@darrachequesne
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