WebSocket behaves differently and breaks on connection

[wfzyx]

What version of Bun is running?

1.2.4+fd9a5ea66

What platform is your computer?

Linux 6.12.13-200.fc41.x86_64 x86_64 unknown

What steps can reproduce the bug?

• bun add tiktok-live-connector
• Use the attached minimal example
• try running the script as bun run script.ts

import { WebcastPushConnection } from "tiktok-live-connector";
const tiktokUsername = "<insert any currently live TikTok username>";
const tiktokLiveConnection = new WebcastPushConnection(tiktokUsername, {
	enableWebsocketUpgrade: true,
});

tiktokLiveConnection.on("error", (err) => {
	console.error("An error occurred:", err);
});

tiktokLiveConnection.on("streamEnd", () => {
	console.log("Live stream has ended");
});

tiktokLiveConnection.on("disconnected", () => {
	console.log("Disconnected from the live stream");
});

tiktokLiveConnection.on("chat", (data) => {
	console.log(`Chat: ${data.uniqueId} says: ${data.comment}`);
});

tiktokLiveConnection
	.connect()
	.then((state) => {
		console.log(`Connected to roomId ${state.roomId}`);
	})
	.catch((err) => {
		console.error("Failed to connect", err);
	});

What is the expected behavior?

When running with bunx deno script.ts, or using wscat to connect to the websocket, it works fine;

What do you see instead?

The server answers that there is no option to upgrade to a websocket

Additional information

No response

[wfzyx]

I've investigated a bit more; The server answers with 1002 - CLOSE_PROTOCOL_ERROR

I believe the issue lays on buildRequestBody at bun/src/http/websocket_http_client.zig

I'm trying to troubleshoot the root cause

EDIT:

The issue is reproducible by dumping the websocket url and headers to console, writing a manual connection, and quitting the headers;

const url = '...'
const headers = {...}
const ws = new WebSocket(url, { headers }); // returns 1000
const ws2 = new WebSocket(url); // returns 1002

EDIT2:

The listed library uses https://www.npmjs.com/package/websocket - which by default doesn't use W3C implementation;
So I'm guessing that the polyfill isn't fully working?