Issue 32437: UnicodeError: 'IDNA does not round-trip' (original) (raw)

First: This is the bug:

In [1]: 'großhandel-shop'.encode('idna') Out[1]: b'grosshandel-shop'

This lead to this:

'xn--einla-pqa'.decode('idna') Traceback (most recent call last): File "", line 1, in File "/usr/lib/python3.6/encodings/idna.py", line 214, in decode result.append(ToUnicode(label)) File "/usr/lib/python3.6/encodings/idna.py", line 139, in ToUnicode raise UnicodeError("IDNA does not round-trip", label, label2) UnicodeError: ('IDNA does not round-trip', b'xn--einla-pqa', b'einlass')

https://stackoverflow.com/questions/9806036/idna-does-not-round-trip

xn--grohandel-shop-2fb has been correctly encoded by IDNA 2008 (which is correct in Germany/DENIC since a while). Your Python very likely tries to decode it using the old IDNA 2003, which doesn't know 'ß'. see denic.de/en/know-how/idn-domains