WebSocket
1007 Invalid Payload Data
An endpoint received a message with payload data that is inconsistent with the message type. For example, a text message contained non-UTF-8 data.
When You See This Code
A text frame was received but its payload is not valid UTF-8. This commonly happens when binary data is accidentally sent as a text frame.
How to Fix
Ensure text frames contain only valid UTF-8 encoded data. If you need to send raw bytes, use binary frames instead of text frames.