--145ae7dc-e075-478c-8063-eeb765e0e15a
Content-Type: image/jpeg;
Content-Length: 41946
MIME-Version: 1.0

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WebClient webClient = new WebClient();
webClient.Headers["Accept"] = textBoxMimeType.Text;

var uri = new Uri(url);
using (Stream webStream = webClient.OpenRead(uri))
{
    using (FileStream fileStream = new FileStream(outputFile, FileMode.Create))
    {
        var buffer = new byte[32768];
        int bytesRead;
        Int64 bytesReadComplete = 0;
        Int64 bytesTotal = Convert.ToInt64(webClient.ResponseHeaders["Content-Length"]);

        while ((bytesRead = webStream.Read(buffer, 0, buffer.Length)) > 0)
        {
             bytesReadComplete += bytesRead;
             fileStream.Write(buffer, 0, bytesRead);
        }
     }
}