[issue17796] No mimetype guessed for tar.xz url

[R. David Murray]

R. David Murray added the comment:

Adding xz was treated as an enhancement in issue 16316.  Our thinking about applying these types of changes as bug fixes has evolved a bit, so I think we can consider backporting it.

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nosy: +r.david.murray

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<http://bugs.python.org/issue17796>
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