Content-Disposition header with filename* returns not just the filename

[m1h43l]

I am trying to upload a file. The receiving server (Helidon 2.x) is using jersey-media-multipart. I am getting the filename via the FormDataContentDisposition object but the filename is the whole string value from the filename* attribute from the Content-Disposition header. I would have expected just the real filename.

I have tried this with jersey-media-multipart 2.40.

I am sending this

Content-Disposition: form-data; name="avatar"; filename="Ueberflieger.jpg"; filename*=UTF-8'de'%C3%9Cberflieger.jpg

and would have expected to get just Überflieger.jpg from the ContentDisposition::getFileName method but I got UTF-8'de'%C3%9Cberflieger.jpg.

Is this the correct behaviour? If it is then how do I get the expected result of Überflieger.jpg from the filename value I get from the ContentDisposition class?

[jansupol]

This is encoding as per RFC 5987 for Ü.

[m1h43l]

Yes, the encoded value is ok.

But what I am noting is that ContentDisposition::getFileName just returns the encoded value. It doesn't do any decoding. Is this the expected behaviour? Just returning the encoded value and the caller will have to do the decoding by himself?

[jansupol]

Shouldn't ContentDisposition::getFileName return the filename, i.e. Ueberflieger.jpg and ContentDisposition::getExtendedFilename return Überflieger.jpg ?

[m1h43l]

There is no getExtendedFilename in jersey-media-multipart 2.40.

[NicolaIsotta]

Noticed that behavior too. I have to substring the result, it's quite annoying.