RTF file not supported by the API (UploadFile)

[BartRennes]

Hello,

The Gemini SDK supports RTF file, but when using generative-ai with UpLoadFile, i receive this error:
System.NotSupportedException : 'The mime type application/rtf is not supported by the API.'

Do you plan to support RTF file in Upload?

Here the code used:

GenerateContentRequest _request = new GenerateContentRequest(pAction.Prompt);
UploadMediaResponse _responseUpload = await g_ClientAI_Google.UploadFile(pFile, Path.GetFileName(pFile));
_request.AddMedia(_responseUpload.File);

Regards,
Jc

[jochenkirstaetter]

Hi @BartRennes

Thanks for reporting this.
Yes, the Gemini SDK for NET uses a guarding method to check for allowed MIME types.

I'm going to extend it to support the latest ones. Next release, probably in a few hours, will resolve the issue.

Do you have a source / link regarding the currently allowed MIME types? There are probably more than RTF...

Thanks.

[jochenkirstaetter]

Hi @BartRennes

Quickly checking the guarding method reveals that the MIME type "text/rtf" is allowed.
As a quick workaround until the next release you could use this value.

I was using Google's documentation: https://ai.google.dev/gemini-api/docs/document-processing

Cheers.

[jochenkirstaetter]

Hi @BartRennes

The issue has been resolved in release v2.2.6

Thanks again!

[BartRennes]

Wow! Great, thank you, i will test it.

[BartRennes]

Just tested with 2.2.6, and it still doesn't work, here the error message:
Unable to submit request because it has a mimeType parameter with value application/rtf, which is not supported. Update the mimeType and try again.

[jochenkirstaetter]

Hi @BartRennes

OK, but this is now the response from the Gemini API.
I already filled an issue with Google that the MIME type value is not according to the Mozilla Developer Network and it should support both values "application/rtf" as well as "text/rtf".

Well, this means that v2.2.6 just introduced a regression issue and should be reverted. Hmm, silly me not writing a test case...

You have to use "text/rtf" and it should work.

Cheers.

[jochenkirstaetter]

Hi @BartRennes

The File API doesn't care about the MIME type and excepts both.

However, running tests with the identical file using either MIME type produces different HTTP responses.

shows the response you reported in case of "application/rtf" whereas "text/rtf" is accepted and processed.

It's an issue in the Gemini API itself, not the SDK.

Cheers.

[jochenkirstaetter]

Hi @BartRennes

Just pushed release v2.2.7 to provide a workaround to the deficit in the Gemini API.

Cheers.

[jochenkirstaetter]

Issue reported: https://discuss.ai.google.dev/t/mime-type-of-rich-text-format-rtf-inconsistent-wrong/67388

[BartRennes]

Thank you for workaround in 2.2.7, good job ;)

[jochenkirstaetter]

Hi @BartRennes

Either use v2.2.7 or extend your line of code

_request.AddMedia(_responseUpload.File);

with the second parameter mimeType to explicitly pass in the override.

Your code should look like this:

var mimeType = _responseUpload.MimeType;
if (mimeType == "application/rtf")
{
  mimeType = "text/rtf";
}
_request.AddMedia(_responseUpload.File, mimeType);

Hope this helps.

[jochenkirstaetter]

Hello @BartRennes

Thanks for the positive feedback and glad it works for you now.

However, the root cause of this issue lies with the Gemini API not accepting the (more) correct MIME type application/rtf. I'm going to revert the workaround as soon as I get a follow-up / change in the API. For now, I'll leave it in.

Again, thanks for reporting this and I'm happy to have it analysed and resolved.

Cheers