import ( "github.com/gorilla/websocket" "fmt" ) func main() { // create a WebSocket connection conn, _, err := websocket.DefaultDialer.Dial("wss://example.com/ws", nil) if err != nil { panic(err) } // set the pong handler function conn.SetPongHandler(func(payload []byte) { fmt.Println("pong received:", string(payload)) }) // send a ping message err = conn.WriteMessage(websocket.PingMessage, []byte("hello")) if err != nil { panic(err) } // wait for the pong message to be received // (in a real application, we would use a goroutine to handle incoming messages) _, message, err := conn.ReadMessage() if err != nil { panic(err) } fmt.Println("ping result:", string(message)) }In this example, we create a WebSocket connection and set the pong handler function to print the payload of received pong messages. We then send a ping message and wait for the corresponding pong message to be received. Overall, the gorilla/websocket package is a package that provides a WebSocket implementation in Go. It is a powerful package for real-time applications and provides many features like subprotocols, message compression, and concurrency safety.