Websocket miss StreamMessage::Connected to listener connect success.

[swm188]

Summary

Websocket miss StreamMessage::Connected to listener connect success. When connected success can do somethings.

Motivation

When connected success can do somethings.

Detailed Explanation

enum StreamMessage {
    ErrorEvent,
    CloseEvent(CloseEvent),
    Message(Message),
    ConnectionClose,
    Connected,
}