I have been at this for a week and it's getting frustrating. On the final upload request, I get the error "Invalid Content-Range header." All other chunk uploads are successful, only the last one gets this error. How do I set the "Content-Range" header for uploading file chunks using the MS Graph API?

This is my latest code:

        using (var fileStream = File.OpenRead(attachmentLocation))
        {
            var buffer = new byte[1000 * 1024];
            int bytesRead;
            long totalBytesUploaded = 0;

            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0)
            {
                var requestEmail = new RestRequest(upload_url, Method.Put);

                requestEmail.AddHeader("Content-Type", "application/octet-stream");
                //requestEmail.AddHeader("Content-Length", bytesRead);                    
                requestEmail.AddHeader("Content-Range", $"bytes {totalBytesUploaded}-{totalBytesUploaded + bytesRead - 1}/{fileStream.Length}");

                requestEmail.AddBody(buffer, ContentType.Json);

                var response = client.Execute(requestEmail);
                totalBytesUploaded += bytesRead;
            }
        }

I have been at this for a week and it's getting frustrating. On the final upload request, I get the error "Invalid Content-Range header." All other chunk uploads are successful, only the last one gets this error. How do I set the "Content-Range" header for uploading file chunks using the MS Graph API?

This is my latest code:

        using (var fileStream = File.OpenRead(attachmentLocation))
        {
            var buffer = new byte[1000 * 1024];
            int bytesRead;
            long totalBytesUploaded = 0;

            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0)
            {
                var requestEmail = new RestRequest(upload_url, Method.Put);

                requestEmail.AddHeader("Content-Type", "application/octet-stream");
                //requestEmail.AddHeader("Content-Length", bytesRead);                    
                requestEmail.AddHeader("Content-Range", $"bytes {totalBytesUploaded}-{totalBytesUploaded + bytesRead - 1}/{fileStream.Length}");

                requestEmail.AddBody(buffer, ContentType.Json);

                var response = client.Execute(requestEmail);
                totalBytesUploaded += bytesRead;
            }
        }

• c#
• microsoft-graph-api
• filestream
• restsharp

1 Answer 1

The last content range must take into account the file size and set the correct end of the range

Something like

if (totalBytesUploaded + bytesRead - 1 >= fileStream.Length)
{
    requestEmail.AddHeader("Content-Range", $"bytes {totalBytesUploaded}-{fileStream.Length - 1}/{fileStream.Length}");
}
else
{
    requestEmail.AddHeader("Content-Range", $"bytes {totalBytesUploaded}-{totalBytesUploaded + bytesRead - 1}/{fileStream.Length}");
}