STINNER Victor <vstin...@redhat.com> added the comment:

> Will this break something in the world other than our own test_xmlrpc test?  
> Probably. Do they have a right to complain about it?  Not one we need listen 
> to.

I understand. But. Can we consider that for old Python versions like Python 2.7 
and 3.5?

This change will be applied to all supported Python versions.

I recall that when Python 2.7 started to validate TLS certificate, the change 
broke some applications. Are these applications badly written? Yes! But well, 
"it worked well before". Sometimes, when you work in a private network, the 
security matters less, whereas it might be very expensive to fix a legacy 
application. At Red Hat, we developed a solution to let customers to opt-out 
from this fix (to no validate TLS certificates), because it is just too 
expensive for customers to fix their legacy code but they would like to be able 
to upgrade RHEL.

One option to not validate URLs is to downgrade Python, but I'm not sure that 
it's the best compromise :-/

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<https://bugs.python.org/issue30458>
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