add content-type header and error response

handlers/infos.go

@@ -34,6 +34,7 @@ func getActiveIP() string {
 }
 
 func InfoHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
 	port := env.Port.GetValue()
 	if port == "" {
 		port = "8080"
@@ -49,5 +50,9 @@ func InfoHandler(w http.ResponseWriter, r *http.Request) {
 		"port":  port,
 		"speed": GetInterval(),
 	}
-	json.NewEncoder(w).Encode(data)
+	err := json.NewEncoder(w).Encode(data)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
 }