[issue38216] Fix for issue30458 (HTTP Header Injection) prevents crafting invalid requests

[Gregory P. Smith]

Change by Gregory P. Smith <greg at krypto.org>:


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versions:  -Python 3.6, Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38216>
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