[3.6] bpo-38576: Disallow control characters in hostnames in http.client (GH-18995) #19002
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Add host validation for control characters for more CVE-2019-18348 protection.
(cherry picked from commit 9165add)
Co-authored-by: Ashwin Ramaswami aramaswamis@gmail.com
https://bugs.python.org/issue38576