How to properly handle JSON POST request in Go? Problems with decoding

Hello everyone! I just started learning Go and am writing a simple REST API. I encountered a problem when handling a JSON POST request. My code seems logical, but the server always returns empty data or an error. Here is my handler code: ```go func CreateUserHandler(w http.ResponseWriter, r *http.Request) { if r.Method != http.MethodPost { http.Error(w, "Method not allowed", http.StatusMethodNotAllowed) return } var user User err := json.NewDecoder(r.Body).Decode(&user) if err != nil { http.Error(w, err.Error(), http.StatusBadRequest) return } defer r.Body.Close() fmt.Printf("User received: %+v\n", user) w.WriteHeader(http.StatusCreated) json.NewEncoder(w).Encode(user) } ``` User struct: