Bug:fail to encode domain(test_a.abc.com) about idna HOT 4 CLOSED

@ZhaoQi99 FYI: this has been reported (and closed) three times already. It struck to me, too, today, which is why I am even here ;) There is a work around available in #50 (comment).

from idna.

That's how it's supposed to work. IDNA2008 specifically lists the characters allowed in hostnames, and _ is not one of them.
It would be a good idea to have some options to deal with domain names that are not hostnames. In your case an option to allow ASCII names with non-hostname characters. Another options could do NFC or UTS46 preprocessing.
FYI, although it is valid to have an underscore in a domain name, it's not valid in a hostname that names a computer such as a web server.

from idna.

Thanks,I think is really a good idea to add an option to solve this problem.
FYI, it could add an option such as errors="weak" which can deal with domain names that are not hostnames.

from idna.

@ZhaoQi99 FYI: this has been reported (and closed) three times already. It struck to me, too, today, which is why I am even here ;) There is a work around available in #50 (comment).

Thanks!

from idna.