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�ˀX�@s>dZddlZddlmZmZdZejdkZGdd�de�ZdS)aHBackport of urllib3's HTTPHeaderDict for older versions of requests.

This code was originally licensed under the MIT License and is copyrighted by
Andrey Petrov and contributors to urllib3.

This version was imported from:
https://github.com/shazow/urllib3/blob/3bd63406bef7c16d007c17563b6af14582567d4b/urllib3/_collections.py
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