class Program
    {
        static void Main(string[] args)
        {
            const string uri = "http://127.0.0.1/adde61103208ff33deb6e8fa70f79706";
            var req = WebRequest.Create(uri) as HttpWebRequest;
            //req.ContentType = "application/octet-stream";
            if (req != null)
            {
                var response = req.GetResponse() as HttpWebResponse;
                if (response != null)
                {
                    Console.WriteLine("ContentType:" + response.ContentType);
                    var stream = response.GetResponseStream();
                    if (stream != null)
                    {
                        string format = string.Empty;
                        switch (response.ContentType)
                        {
                            case "image/jpeg":
                                format = "jpg";
                                break;
                            case "audio/amr":
                                format = "amr";
                                break;
                        }

                        var path = string.Format(@"c:\\1.{0}", format);
                        //var fs = new FileStream($"c:\\1.{format}", FileMode.Create);
                        var fs = File.Create(path);

                        int count = 0;
                        do
                        {
                            var buffer = new byte[4096];
                            count = stream.Read(buffer, 0, buffer.Length);
                            fs.Write(buffer, 0, count);
                        } while (count > 0);
                    }
                }
            }
            Console.ReadKey();
      }
}