Misused header name, 'Content-Type'. Make sure request headers are used with HttpRequestMessage, response headers with HttpResponseMessage, and content headers with HttpContent objects.'

[kasunf]

I got this error when sending filedata

   Misused header name, 'Content-Type'. Make sure request headers are used with HttpRequestMessage, response headers with 
   HttpResponseMessage, and content headers with HttpContent objects.'

Here is my code
var httpClient = new HttpClient();

    httpClient.BaseAddress = WhatsAppBusinessRequestEndpoint.BaseAddress;
    

    var whatsAppBusinessClient = new WhatsAppBusinessClient(httpClient, whatsAppConfig); 

    var media = await whatsAppBusinessClient.UploadFileDataAsync("1",path, "application/pdf");



    var url = await whatsAppBusinessClient.GetMediaUrlAsync(media.Id);

    DocumentMessageByUrlRequest documentMessage = new DocumentMessageByUrlRequest();
    documentMessage.To =No;
    documentMessage.Document = new MediaDocumentUrl();
    documentMessage.Document.Link = url.Url;

    var results = await whatsAppBusinessClient.SendDocumentAttachmentMessageByUrlAsync(documentMessage);

[gabrieldwight]

Hi @kasunf, The function above UploadFileDataAsync was for the resumable upload API, you will need to create an upload session Id first. I have tested it with image files only. The same steps should work with document files once you have created an upload session id.

var uploadSessionId = await whatsAppBusinessClient.CreateResumableUploadSessionAsync(long fileLength, string fileType, string fileName);

var media = await whatsAppBusinessClient.UploadFileDataAsync(uploadSessionId, path, "application/pdf");

var url = await whatsAppBusinessClient.GetMediaUrlAsync(media.Id);

Alternatively, you can use the uploadMediaFunction

UploadMediaRequest uploadMediaRequest = new UploadMediaRequest();
uploadMediaRequest.File = path;
uploadMediaRequest.Type = "application/pdf";

var uploadMediaResult = await _whatsAppBusinessClient.UploadMediaAsync(uploadMediaRequest);

var url = await whatsAppBusinessClient.GetMediaUrlAsync(media.Id);

[gabrieldwight]

Let me try to prepare a .NET MAUI sample to check how it handles media uploads then I will let you know

[kasunf]

here is a MAUI sample project https://github.com/kasunf/WhatsApp-MAUI , Can you please try it?

[gabrieldwight]

Let me try and test it then I get back to you

[gabrieldwight]

On my side, it is working with the MAUI you sent using the file picker API

var customFileType = new FilePickerFileType(
			new Dictionary<DevicePlatform, IEnumerable<string>>
				{
					{ DevicePlatform.iOS, new[] { "" } }, // UTType values
                    { DevicePlatform.Android, new[] { "image/jpeg", "image/png", "application/pdf" } }, // MIME type
                    { DevicePlatform.WinUI, new[] { ".png", ".jpg", ".pdf" } }, // file extension
                    { DevicePlatform.Tizen, new[] { "*/*" } },
					{ DevicePlatform.macOS, new[] { "" } }, // UTType values
                });

		PickOptions options = new()
		{
			PickerTitle = "Please select a media file",
			FileTypes = customFileType,
		};

		FileResult fileResult = await PickAndShow(options);

		string path = fileResult.FullPath;

string fileName = path;
        FileInfo fi = new FileInfo(fileName);
        UploadMediaRequest uploadrequest = new UploadMediaRequest();
        uploadrequest.File = path;
		uploadrequest.Type =  fileResult.ContentType; //"application/pdf";
        var media =  await whatsAppBusinessClient.UploadMediaAsync(uploadrequest);

if (fi.Extension.Contains("jpg") || fi.Extension.Contains("png"))
		{
			ImageMessageByIdRequest imageMessage = new ImageMessageByIdRequest();
			imageMessage.To = no;
			imageMessage.Image = new MediaImage();
			imageMessage.Image.Id = media.MediaId;
			imageMessage.Image.Caption = "MAUI Image Test";

			await whatsAppBusinessClient.SendImageAttachmentMessageByIdAsync(imageMessage);
		}
		else
		{
			DocumentMessageByIdRequest documentMessage = new DocumentMessageByIdRequest();
			documentMessage.To = no;
			documentMessage.Document = new MediaDocument();
			documentMessage.Document.Id = media.MediaId;
			documentMessage.Document.Caption = "MAUI PDF Test"; //"hello";
			documentMessage.Document.Filename = fi.Name; //"hello.pdf";


			await whatsAppBusinessClient.SendDocumentAttachmentMessageByIdAsync(documentMessage);
		}

File Picker API

public async Task<FileResult> PickAndShow(PickOptions options)
	{
		try
		{
			var result = await FilePicker.Default.PickAsync(options);
			/*if (result != null)
			{
				if (result.FileName.EndsWith("jpg", StringComparison.OrdinalIgnoreCase) ||
					result.FileName.EndsWith("png", StringComparison.OrdinalIgnoreCase))
				{
					using var stream = await result.OpenReadAsync();
					var image = ImageSource.FromStream(() => stream);
				}
				else
				{
					using var stream = await result.OpenReadAsync();
				}
			}*/

			return result;
		}
		catch (Exception ex)
		{
			// The user canceled or something went wrong
		}

		return null;
	}

Results:
Media Message

Document Message

[kasunf]

This is working perfectly. I changed the path to auto generated invoice and it worked. Thank you so much.