Unity gets images through url

Enumerator DownloadImage(string url)
    {
    
    
        WWW www = new WWW(url);
        yield return www;
        Texture2D tex2d = www.texture;
        Sprite m_sprite = Sprite.Create(tex2d, new Rect(0, 0, tex2d.width, tex2d.height), new Vector2(0, 0));
        SetImage(m_sprite);
    }