WebSocket client connection drops if an unknown opcode is received

[mia-z]

What version of Bun is running?

0.4.0

What platform is your computer?

Microsoft Windows NT 10.0.22000.0 x64

What steps can reproduce the bug?

1. Using the global WebSocket implementation, create a Websocket connection const ws = new WebSocket("wss://arealwebsocket.url");

2. Receive message that has an opcode that bun's global WebSocket implementation isn't familair with -- in my case I was receiving MessageEvent { type: "message", data: "unknown opcode 15" }

3. After receiving the previous message, the connection will drop. Wrapping the callback in a try-catch block doesnt prevent the connection from dropping.

What is the expected behavior?

The connection should persist -- or at the very least throw an exception.

What do you see instead?

No response

Additional information

At first I thought opcode 15 was PING or PONG until I read rfc6455 about reserved WebSocket opcodes. I assume this problem is due to opcodes outside the reserved range (if they're implemented or handled in Bun/the wrapper).

[Jarred-Sumner]

Its a protocol error, disconnecting is the correct behavior

I think the bug here is an issue in Bun's implementation of the websocket client and not that it disconnects

[Electroid]

We need to test our WebSocket client using the Autobahn test suite to fix these bugs, including this one. For updates, please upvote and subscribe to this issue: https://github.com/oven-sh/bun/issues/6686