go-socket.io Why do I get "superfluous response.WriteHeader"?

Why do I get "superfluous response.WriteHeader"?

Open viktoriia-starikova opened this issue 5 years ago • 11 comments

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When connecting to the server I get an error:

2020/07/14 16:29:51 http: superfluous response.WriteHeader call from github.com/googollee/go-engine%2eio.(*Server).ServeHTTP (server.go:146)

Code on the server `package main import ( "fmt" "log" "net/http" "github.com/gorilla/mux" "github.com/gorilla/handlers"

socketio "github.com/googollee/go-socket.io"

)

func main() { fmt.Println("Hello world") router := mux.NewRouter() router.HandleFunc("/is-alive", isAlive).Methods("GET")

server, err := socketio.NewServer(nil)
if err != nil {
	log.Fatal(err)
}

server.OnConnect("/", func(s socketio.Conn) error {
	s.SetContext("")
	fmt.Println("connected:", s.ID())
	s.Emit("change")
	s.Join("bcast")
	return nil
})

server.OnEvent("/", "msg", func(s socketio.Conn, msg string) string {
	s.SetContext(msg)
	fmt.Println("event: msg")
	return "recv " + msg
})

server.OnError("/", func(s socketio.Conn, e error) {
	fmt.Println("meet error:", e)
})

server.OnDisconnect("/", func(s socketio.Conn, reason string) {
	fmt.Println("closed", reason)
})

go server.Serve()
defer server.Close()

router.Handle("/socket.io/", server)

log.Println("Serving at localhost:4444...")
log.Fatal(http.ListenAndServe(":4444", handlers.CORS(handlers.AllowedOrigins([]string{"*"}))(router)))

}

func isAlive(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusOK) }`