Как получить изображение, используя Get запрос?

 public FileResult GetMiniatureScreen()
        {
            string url = "https://vcd.selectel.ru/api/vApp/vm-ххх/screen";
             HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
             req.Method = "GET";
             req.Headers.Add("Authorization", "Bearer " + Project.Models.MainViewModel.Token);
             req.Headers.Add("Accept-Charset", "utf-8, iso-8859 - 1; q=0.5");
             req.Headers.Add("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3");
             req.Accept = "*/*;version=30.0";
            HttpWebResponse res = (HttpWebResponse)req.GetResponse();
            StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8);
            string Out = sr.ReadToEnd();
            sr.Close();
            return File(Out, "image/png");
        }

public FileResult GetMiniatureScreen()
{
    string url = "https://vcd.selectel.ru/api/vApp/vm-ххх/screen";
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    req.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; // На всякий случай
    req.Method = "GET";
    req.Headers.Add("Authorization", "Bearer " + Project.Models.MainViewModel.Token);
    req.Headers.Add("Accept-Charset", "utf-8, iso-8859 - 1; q=0.5");
    req.Headers.Add("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3");
    req.Accept = "*/*;version=30.0";
    byte[] bytes;
    using (HttpWebResponse res = (HttpWebResponse)req.GetResponse())
    using (Stream responseStream = res.GetResponseStream())
    using (MemoryStream mstream = new MemoryStream())
    {
        responseStream.CopyTo(mstream);
        bytes = mstream.ToArray();
    }
    return File(bytes, "image/png");
}