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7096e98a02
The "connection_error" event will be emitted when one of the following
errors occurs:
- Transport unknown
- Session ID unknown
- Bad handshake method
- Bad request
- Forbidden
- Unsupported protocol version
Syntax:
```js
server.on("connection_error", (err) => {
console.log(err.req); // the request object
console.log(err.code); // the error code, for example 1
console.log(err.message); // the error message, for example "Session ID unknown"
console.log(err.context); // some additional error context
});
```
Related:
- https://github.com/socketio/socket.io/issues/3819
- https://github.com/socketio/engine.io/issues/576