connect handler

// Handle $connect event
func connectHandler(c echo.Context) error {
    // Extract connection ID from headers
    connectionID := c.Request().Header.Get("Sec-WebSocket-Protocol")

    // Perform actions when a client connects
    fmt.Printf("Client connected: %s\n", connectionID)  // ==========> we didn't get the connectionID, it's empty
    
    // Respond with a 200 status code
    return c.String(http.StatusOK, "Connected")
}