写一段golang 功能是:Websocket 服务端

package main import ( "fmt" "net/http" "github.com/gorilla/websocket" ) var upgrader = websocket.Upgrader{} // use default options func echo(w http.ResponseWriter, r *http.Request) { c, err := upgrader.Upgrade(w, r, nil) if err != nil { fmt.Println("upgrade:", err) return } defer c.Close() for { mt, message, err := c.ReadMessage() if err != nil { fmt.Println("read:", err) break } fmt.Printf("recv: %s", message) err = c.WriteMessage(mt, message) if err != nil { fmt.Println("write:", err) break } } } func main() { http.HandleFunc("/echo", echo) http .ListenAndServe(":8080", nil)}