+1
"x-" prefix indicates ad hoc (unofficial), not deprecated.
I agree, an official MIME type should be preferred over an unofficial
one.
On Tue, 2022-01-18 at 16:26 +0000, mil...@gmail.com wrote:
> mimetypes are parsed from the file /etc/mime.types
>
> cat /etc/mime.types | grep javascript
> application/javascript js
> application/x-javascript js
>
> actual:
> mimetypes.guess_type("x.js") == "application/x-javascript"
> -> deprecated mimetype
>
> expected:
> mimetypes.guess_type("x.js") == "application/javascript"
>
> spoiler: here, the "x-" part is deprecated.
>
> mimetypes.guess_type returns the deprecated mimetype
> because python returns the last entry in the /etc/mime.types file
> which is sorted alphabetically
>
> proposed solution:
> use a smarter conflict-resolution when parsing /etc/mime.types.
> when two entries are found for one file-extension,
> avoid using a deprecated mimetype.
> rfc4329 lists 16 items for "unregistered media type"
> these could be hard-coded as set-of-strings, or as regex.
>
> related bug report
> https://bugs.python.org/issue46035
>
> mimetypes.guess_type
> https://docs.python.org/3/library/mimetypes.html#mimetypes.guess_type
>
> unregistered media type
> https://datatracker.ietf.org/doc/html/rfc4329#section-3
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