high performance event delivery server based on WebSockets.
- WebSocket-based subscription
- Simple API
- Multi server support
- Fast message delivery
- Event synchronization and inter-transmission between servers
- Automatic recovery of connection between servers
- High concurrency
- Server-to-server authentication with HMAC SHA-384
- Resistance to replay attacks
- Low memory usage and low memory leak
- User-specified event type can be set in the message