Having problems uploading PDF file via REST API using C#

I am currently writing a C# program that uses the Sharepoint REST API to manage uploading and downloading of files.

Currently can retrieve files stored in folders in a subsite without problems, but I am having issues with uploading files to the same folders.

I use “/_api/web/getfolderbyserverrelativeurl(‘/Folder1/Folder2/File)$value” to retrieve a file. This works fine.

I can also get the folder itself via “_api/web/getfolderbyserverrelativeurl(‘/Folder1/Folder2′)
I am thinking I can use the same URI structure to add a file to that folder by adding “/files/add(url=’filename’, overwrite=true)” to the end of the above URI.
Set the method to “POST”, Accept to “application/json; odata=verbose”, ConentLength to length of file being sent. Also added Authorization and X-RequestDigest headers to the webrequest.

When the webrequest is sent to the server I get the following errors back (after about 30secs).

  • HttpRequestException: An error occurred while sending the request
  • IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host
  • SocketException: An existing connection was forcibly closed by the remote host

My question is… Has anyone else seen these sort of errors before and am I approaching this is the correct way.

Also related to this, once I get this file uploaded how do I add metadata to it? Or does the meta data get added to the file as it is uploaded?

I seem to have sorted the initial errors with the post request. Did a rewrite with the way I was sending the request. Now uses the HttpWebRequest object to do the work. But now I am getting a “400 Bad Request” error. This is the request URL that I am using https://server/_api/web/GetFolderByServerRelativeUrl('/Folder1/Folder2/Folder3/Folder4')/Files/add(url='FileName',overwrite=False) Have I missed something in constructing the request?
Further to all this, I have a feeling that the way I am uploading the pdf file is incorrect.
Here is my code that I am using to send.

HttpWebRequest restRqst = (HttpWebRequest)HttpWebRequest.Create(endpointUrl);
restRqst.UseDefaultCredentials = false;
restRqst.Credentials = auth.GetCredentials(_userName, _password);
restRqst.Method = "POST";
restRqst.Accept = "application/json; odata=verbose";
restRqst.Headers.Add("Authorization", "Bearer " + auth.GetAccessToken(_siteUri, _userName, _password));
restRqst.Headers.Add("X-RequestDigest", auth.GetFormDigestValue(_sharePointSiteURL, auth.GetCredentials(_userName, _password), auth.GetAccessToken(_siteUri, _userName, _password)));
restRqst.Timeout = 1000000;

var b = stream.ToArray();
restRqst.ContentLength = b.Length;
     using (Stream postStream = restRqst.GetRequestStream())
      postStream.Write(b,0, b.Length);
catch(Exception ex)
     WebResponse wresp = restRqst.GetResponse();
     using (System.IO.StreamReader sr = new System.IO.StreamReader(wresp.GetResponseStream()))
       result = sr.ReadToEnd();
       status = true;
       return Task.CompletedTask;
catch (Exception ex)

Any thoughts or comments are very much appreciated.

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Currently, the expected transfer time is over 45 hours and climbing.

Maybe my math is wrong but 1.5 TB at 600 MBps using a USB 3.0 cable should only take about 45 minutes, right? Even if I was just using a USB 2.0 cable with 60 MBps, it still shouldn’t take much more than 7 hours.

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Uploading files works fine in desktop and laptop, but from a phone/mobile device it doesn’t work. The background process (AJAX) of file uploading goes into a endless loop.

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Excel file corrupted after uploading to SharePoint with VB.NET

Excel file corrupted after uploading (.xlsx file) to SharePoint with VB.NET, I got that error message while opening excel file after uploaded to SharePoint “Excel cannot open the file ‘Input.xlsx’ because the file format or file extension is not valid. Verify that the file has not been currented and that the file extension matches the format of the file”. Can you please share the VB.NET code to upload .xlsx file SharePoint.

Dim client As HttpClient = New HttpClient()
client.BaseAddress = New Uri("https://****.sharepoint.com/sites/ChinaBot/_api/web/GetFolderByServerRelativeUrl('FilderName')/Files/add(url='File.xlsx',overwrite=true)")
client.DefaultRequestHeaders.Accept.Add(New MediaTypeWithQualityHeaderValue("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"))
client.DefaultRequestHeaders.Add("binaryStringRequestBody", "true")
client.DefaultRequestHeaders.Add("authorization", "Bearer Access Token")
Dim request As MultipartFormDataContent = New MultipartFormDataContent()
request.Add(New StringContent("Bad"), "tags")
request.Add(New StringContent("true"), "displayreferencetext")
request.Add(New StringContent("0.63"), "similaritythreshold")
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Dim response As HttpResponseMessage = client.PostAsync("", request).Result
Dim strm As Stream = response.Content.ReadAsStreamAsync.Result
Dim doc As Byte()
Dim ms As MemoryStream = New MemoryStream()
doc = ms.ToArray()
File.WriteAllBytes("C:\RPA Files\rez.docx", doc)

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enter image description here

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