This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.
**練習 1.8:** 脩改fetch這個範例,如果輸入的url參數沒有http://前綴的話,為這個url加上該前綴。你可能會用到strings.HasPrefix這個函數。