sse

type Event struct {
	ID      string        // Event ID for client tracking
	Event   string        // Event type/name
	Data    any           // Event payload
	Retry   time.Duration // Reconnection time (converted to milliseconds)
	Comment string        // Optional comment (for keepalive)
}

type StreamOptions struct {
	// Headers to set on the response (merged with defaults)
	Headers map[string]string

	// Retry interval sent to client (0 to omit)
	Retry time.Duration

	// Enable automatic keepalive comments
	Keepalive bool

	// Keepalive interval (default: 15s)
	KeepaliveInterval time.Duration

	// Custom error handler
	OnError func(error)

	// Custom close handler
	OnClose func()
}