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From "Jaime Hablutzel (JIRA)" <>
Subject [jira] [Commented] (FILEUPLOAD-56) [FileUpload] uploading files with non-ASCII filenames
Date Fri, 08 Mar 2013 15:34:12 GMT


Jaime Hablutzel commented on FILEUPLOAD-56:

Haruyi Kawabe I have realized this too, but you should consider that they are not implementing
rfc2388 (which references  rfc2231), commons fileupload claims to implement rfc1867 as the
home page says:

bq. FileUpload parses HTTP requests which conform to RFC 1867, "Form-based File Upload in
HTML". That is, if an HTTP request is submitted using the POST method, and with a content
type of "multipart/form-data", then FileUpload can parse that request, and make the results
available in a manner easily used by the caller.

Anyway rfc1867 references rfc1522 for encoding 'filename' parameter specifically (in 3.3):

bq. The original local file name may be supplied as well, either as a 'filename' parameter
either of the 'content-disposition: form-data' header or in the case of multiple files in
a 'content-disposition: file' header of the subpart. The client application should make best
effort to supply the file name; if the file name of the client's operating system is not in
US-ASCII, the file name might be approximated or encoded using the method of RFC 1522. This
is a convenience for those cases where, for example, the uploaded files might contain references
to each other, e.g., a TeX file and its .sty auxiliary style description.

But, instead commons fileupload is just using a headerEncoding got from the http request,
I don't even understand why are they doing this. 

Anyway they aren't the only doing this, Firefox (from a multipart/form-data) sends 'filename'
parameter encoded with the page encoding (or form accept-charset), and nothing about rfc1522
or rfc2231, I have asked in commons fileupload user mailing list and firefox mailing list
waiting for an explanation, asked in a firefox support forum too:

I think that maybe fixing commons fileupload could bring some interoperability problems, because
browsers (at least firefox) seems to be sending the wrong thing according to specs. Or, maybe
supporting the spec and if encoded-words encoding not found falling back to http request content
type charset... not sure, anyway
> [FileUpload] uploading files with non-ASCII filenames
> -----------------------------------------------------
>                 Key: FILEUPLOAD-56
>                 URL:
>             Project: Commons FileUpload
>          Issue Type: Bug
>    Affects Versions: Nightly Builds
>         Environment: Operating System: All
> Platform: All
>            Reporter: joachim.gjesdal
>         Attachments: ASF.LICENSE.NOT.GRANTED--encoding.diff, ASF.LICENSE.NOT.GRANTED--fileupload_filenamencoding,, ASF.LICENSE.NOT.GRANTED--fileupload.txt,,
> FileUpload does not encode the filename. Uploading files like m√ľnchen.jpeg
> results in a bogus file names.
> (added this to Sandbox component since FileUpload not listed)

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