Antoine Pitrou added the comment:
Actually, I don't this is a bug: match_hostname() expects str data, and
therefore IDNA-decoded domain names:
>>> b"xn--gtter-jua.example.de".decode("idna")
'götter.example.de'
Doing the matching on the decoded domain name should be safe.
Then it very much depends on whether the data you've got was IDNA-decoded, or
naïvely ASCII-decoded, and I don't think the Python stdlib is very consistent
here. Looking at the socket module, gethostbyaddr and getnameinfo seem to use
ASCII decoding...
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<http://bugs.python.org/issue17997>
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