TWebSocketUpgrader.Upgrade Method
Upgrades the connection to the WebSocket protocol, answering the handshake with a 101 status code.
Remarks
Only call it when IsWebSocketRequest returns True. After the connection is upgraded, the response must not be modified through the regular response API.
Syntax
Unit: Sparkle.Middleware.WebSocket
function TWebSocketUpgrader.Upgrade: IWebSocket;