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Re: [media-types] Feedback on a potential media type for upload chunks

Paul Libbrecht <paul@hoplahup.net> Thu, 29 February 2024 10:16 UTC

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From: Paul Libbrecht <paul@hoplahup.net>
To: Marius Kleidl <marius=40transloadit.com@dmarc.ietf.org>
Cc: media-types@iana.org
Date: Thu, 29 Feb 2024 11:16:18 +0100
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Subject: Re: [media-types] Feedback on a potential media type for upload chunks
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Hello Marius,

I am wondering if the partial downloads that are sometimes produced by 
browsers would be concerned by this proposal. For example, on macOS, 
folder with a particular extension (`.part`) have this function.

Thanks

Paul

On 26 Feb 2024, at 20:01, Marius Kleidl wrote:

> Dear working group,
>
> in the HTTP working group, we are discussing a draft for resumable 
> uploads
> over HTTP (
> https://datatracker.ietf.org/doc/draft-ietf-httpbis-resumable-upload/).
> Essentially, for each file that should be uploaded, a new upload 
> resource
> is created on the server. The client can then append data to this 
> upload
> resource by sending a PATCH request. If the transfer gets interrupted, 
> the
> client can query the upload resource's current offset and then resume 
> the
> upload by appending the remaining data using another PATCH request.
>
> As required by RFC 5789, PATCH requests must include a media type to
> describe the message content. In the case of resumable uploads, the 
> content
> is just a partial chunk from the file to be uploaded without any 
> additional
> data included in the message content (no offset or length value). This
> chunk might be textual or binary depending on the file that should be
> uploaded (e.g. text file or video).
>
> I didn't find a registered media type in the standards tree which 
> matches
> those semantics. However, the vendor tree includes
> application/vnd.adobe.partial-upload (
> https://www.iana.org/assignments/media-types/application/vnd.adobe.partial-upload),
> which was registered by Adobe in 2009 for uploads in their web
> applications. Its intention seems to align with the content included 
> in
> PATCH requests for resumable uploads.
>
> Therefore, I am thinking about a standardized media type to describe
> partial chunks from an upload, such as application/partial-upload or
> application/upload-chunk and would love any feedback on that idea.
>
> Best regards
> Marius Kleidl

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