golang ws 

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package main

import (
	"log"
	"net/http"

	"github.com/gorilla/websocket"
)
 
var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
	CheckOrigin: func(r *http.Request) bool {
		return true // 允许所有源，生产环境中应根据需要设置更严格的CORS策略
	},
}
 
func serveWs(w http.ResponseWriter, r *http.Request) {
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println("Failed to set up WebSocket connection:", err)
		return
	}
	defer conn.Close()
 
	for {
		// 读取客户端发送的消息
		msgType, msg, err := conn.ReadMessage()
		if err != nil {
			log.Println("Failed to read WebSocket message:", err)
			break
		}
 
		log.Printf("Received message from client: %s", msg)
 
		err = conn.WriteMessage(msgType, []byte("receive message successfully"))
		if err != nil {
			log.Println("Failed to send WebSocket message:", err)
			break
		}
	}
}
 
func main() {
	http.HandleFunc("/ws", serveWs)
	log.Println("Starting WebSocket server on :8080...")
	err := http.ListenAndServe(":8080", nil)
	if err != nil {
		log.Fatal("Error starting server:", err)
	}
}
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package main
 
import (
	"github.com/gorilla/websocket"
	"log"
	"net/url"
)
 
func main() {
	u := url.URL{Scheme: "ws", Host: "localhost:8080", Path: "/ws"}
	log.Printf("Connecting to %s", u.String())
 
	c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
	if err != nil {
		log.Fatal("Failed to connect to WebSocket server:", err)
	}
	defer c.Close()
 
	err = c.WriteMessage(websocket.TextMessage, []byte("Hello from client!"))
	if err != nil {
		log.Println("Failed to send message:", err)
		return
	}
 
	_, msg, err := c.ReadMessage()
	if err != nil {
		log.Println("Failed to receive message:", err)
		return
	}
 
	log.Printf("Received message from server: %s", msg)
}