Christian Heimes added the comment:

server_hostname is also required for SNI (server name indicator). Virtual 
hosting depends on the feature. Without SNI TLS extension you'll end up on the 
wrong vhost or the web server sends you the wrong certificate.

The feature is pretty much required these days.

assignee:  -> christian.heimes
components: +SSL
nosy: +christian.heimes
versions: +Python 3.7 -Python 3.3, Python 3.4

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