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Updates:
- Renamed the ``Auth`` Abstract Base Class to ``AuthABC``.
- Made the PoolManager or ProxyManger attribute ``manager`` public.
- Made the HTTPHeaderDict attribute ``request_headers`` public.
- Retries applies to all URLLib3 retry types instead of only connect.
- Added 'Request Timeout' and 'Too Early' default retry status codes.
- status_whitelist renamed to status_ignore for better representation.