Unity downloads files through the server address

 public IEnumerator DownLoadToLocal(string downloadingUrl)
        {

           /// Get download information

           UnityWebRequest header = UnityWebRequest.Head(downloadingUrl);
            yield return header.SendWebRequest();
            if (!header.isHttpError && !header.isNetworkError)
            {
                Debug.Log(ulong.Parse(header.GetResponseHeader("Content-Length")));
            }

          /
            // Send download request
            webRequest = UnityWebRequest.Get(downloadingUrl);

           // Set timeout , if webRequest.SendWebRequest() Connection timeout will return , And isNetworkError by true
            webRequest.timeout = 30;
            yield return webRequest.SendWebRequest();

            if (webRequest.isNetworkError)
            {
                Debug.Log("Download Error:" + webRequest.error);
            }