I get this error very often in my web socket application and web socket immediately closes. The only error message I see is "Unrecognized frame opcode: 5 " in my browser console. Can anyone give me an idea why and in which case this error occurs.

Thanks!

I get this error very often in my web socket application and web socket immediately closes. The only error message I see is "Unrecognized frame opcode: 5 " in my browser console. Can anyone give me an idea why and in which case this error occurs.

Thanks!

• javascript
• browser
• websocket

Share Improve this question Follow edited Sep 25, 2012 at 12:58 pmfl asked Sep 25, 2012 at 12:51 pmflpmfl 2,10955 gold badges3131 silver badges4848 bronze badges 2

• This is not a jQuery-specific question. – user659025 Commented Sep 25, 2012 at 12:57
• Can you post client code that demonstrates this please? Also, which server are you using? If its not a standard server, can you also post source for it? – simonc Commented Sep 25, 2012 at 13:00

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1 Answer 1

Sorted by: Reset to default 2

The final draft of the WebSocket RFC 6455 defines opcodes 0, 1, 8, 9 and 10. Old versions (e.g. version 6) have defined opcode 5 to be a binary frame. This is now obsoleted, that opcode no longer exists.

Your server is outdated and only supports old versions of the WebSocket protocol. Many WebSocket servers support multiple versions and are able to switch between them. You should use a server that does that.