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Re:Deprecating Use of the "X-" Prefix in Application Protoco... by kragen on Thursday February 02, 2012 @05:10PM (#3544738)
An example of the problems with "x-", specifically in the BitTorrent MIME type, can be found at https://issues.apache.org/bugzilla/show_bug.cgi?id=20440.

Bram writes:

> I used an x- mimetype becaues IANA says that you should do that when your

> protocol isn't approved by them. Of course, they want everyone to get a

> mimetype without the x- approved by them eventually, which involves a

> compatibility breakage. I see no need for that pain, especially since

> collisions in the mimetype namespace never happen; One of the nice effects

> of it being a string rather than a number.

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