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AttributeError: 'NoneType' object has no attribute 'errno' #2231
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Long story short
Trying to resolve a domain which is an alias for another one, which does not have an A or CNAME record, raises AttributeError: 'NoneType' object has no attribute 'errno'
Expected behaviour
Raise an error correctly, socket.gaierror probably.
Actual behaviour
Steps to reproduce
This script will reproduce the error.
If I use the session without setting the connector it first raises a socket.gaierror but then
And the same traceback appears.
Your environment
Python 3.6.0b2
Ubuntu 10.10
aiohttp==2.2,5
Also happens with aiohttp==2.3.0a0 (installed from git on 29/Aug/2017)
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