WebSocket
1002 Protocol Error
An endpoint is terminating the connection because it received data that violates the WebSocket protocol specification.
When You See This Code
The WebSocket frame format is invalid — a malformed header, incorrect masking, or a reserved opcode was used. This usually indicates a broken client or proxy.
How to Fix
Check that both client and server strictly follow RFC 6455 framing rules. Inspect intermediary proxies that may be corrupting WebSocket frames.