Message 310923 - Python tracker

I am avoiding Python's built-in libraries as much as possible in my aiohttp-based crawler because of this issue, but I cannot open a connection to https://xn--ho-hia.de because there is an 'IDNA does not round-trip' raise in the python 3.6 library ssl.py code.

Happy to provide a code sample. I guess the 500-line async crawler in Guido's book was never used on German websites.